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  • No Cure for a Slow Computer?

    - by Marv
    I have a laptop with the following specs: 2.2gHz dual-core processor. 4gb of DDR2 Ram. 180gb HDD space. I have tried everything. I have reinstalled the OS. Installed Ubuntu with Lubuntu, LXDE, Gnome Classic, Unity 2D desktop. I have even tried downgrading to XP with all non-critical processes and services turned off. Even with the most stripped down version of Ubuntu it heats up and the fan starts churning. I'm out of ideas. I have tried everything. If you have any tips, please help. :'(

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  • VirtualBox running Ubuntu 11.10 in Win7 is suddenly way too slow

    - by elithin
    For two months I've been running Ubuntu 11.10 64bits in VirtualBox 4.1.12r77245 but today everything has been really slow, freezing all the time. I've had to restart the VM about 7 times already because Ubuntu just freezed in the middle of a task. I'm using my laptop, it's a LG P420 i5 with 4gb ram. I don't know if it could be an update of Ubuntu or VB, but I really need it to work. Any guesses? Thanks in advance

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  • how do i use ssh to log into my computer?

    - by tim
    In the past I've been using putty to ssh into my schools fedora computers to do HW, but now I recently put fedora on my computer, and I want make it so that I can ssh to my fedora computer from my school too. I looked through a tutorial, and was able to -make the private key and public key -make a passphrase -move to public key to my school's system -chmod 700 the public key now when I try to ssh into my own computer from school it gives me an error that says I cannot resolve my hostname and name or service unknown I don't know what to do from here, the tutorial was no help after this.

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  • Can't connect to wi-fi hotspot in Ubuntu 11.10

    - by ht3t
    I'm new to Ubuntu. I'm having a wireless network problem in Ubuntu 11.10. I made a hotspot using Connectify from a computer which is running Windows 7. I can access it in Windows 7 but not in Ubuntu 11.10. Every time I access it,I get a message "disconnected". I'm using msi fx 400 notebook with Intel Centrino wireless -N 1000 wireless card. Ubuntu version is 11.10 with KDE desktop. $ sudo lshw -c network [sudo] password for ht3t: *-network description: Wireless interface product: Centrino Wireless-N 1000 vendor: Intel Corporation physical id: 0 bus info: pci@0000:06:00.0 logical name: wlan0 version: 00 serial: 00:26:c7:56:b8:f0 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=iwlagn driverversion=3.0.0-12-generic firmware=39.31.5.1 build 35138 latency=0 link=no multicast=yes wireless=IEEE 802.11bgn resources: irq:44 memory:e7400000-e7401fff *-network description: Ethernet interface product: RTL8111/8168B PCI Express Gigabit Ethernet controller vendor: Realtek Semiconductor Co., Ltd. physical id: 0 bus info: pci@0000:07:00.0 logical name: eth0 version: 06 serial: 40:61:86:b6:b1:a2 size: 100Mbit/s capacity: 1Gbit/s width: 64 bits clock: 33MHz capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl_nic/rtl8168e-2.fw IP=192.168.21.107 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s resources: irq:41 ioport:9000(size=256) memory:e6004000-e6004fff memory:e6000000-e6003fff I can't do anything without internet connection. How can I fix this?

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  • Why does the terminal in unity 2d (Ubuntu 11.10) always stay in the foreground?

    - by user32509
    I have just updated to Ubuntu 11.10 and I am using unity 2d. My terminal applications (gnome-terminal or konsole) just won't go into background. When I move another application in front of them, they are still rendered, but the clicks are going through them. This behavior only appears when the terminal windows interact with another applications. I can move one terminal over another without a problem, but even the menu list of a terminal application can not be shown, since it is - for some unknown reason - "behind" the terminal. Any ideas what might be the cause of this problem? I do not have this problem with my other machines. The only difference is, that I am using unity 2d here and ("normal") unity at home.

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  • My android app crash before load main.xml

    - by Saverio Puccia
    my android app crash before load main.xml. This is the exception thrown java.lang.RuntimeException: Unable to resume activity...: java.lang.NullPointerException What happens? For completeness I enclose my manifest.xml <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="saverio.puccia.nfcauth" android:versionCode="1" android:versionName="1.0" > //permission <uses-sdk android:minSdkVersion="10" /> <uses-permission android:name="android.permission.NFC"></uses-permission> <uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission> //main declaration <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <activity android:name=".NFCAuthActivity" android:label="@string/app_name" > //intent filter declaration <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> <intent-filter> <action android:name="android.intent.action.NDEF_DISCOVER" /> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> </activity> </application> </manifest> LOGCAT 06-25 11:03:23.670: E/AndroidRuntime(4323): FATAL EXCEPTION: main 06-25 11:03:23.670: E/AndroidRuntime(4323): java.lang.RuntimeException: Unable to resume activity {saverio.puccia.nfcauth/saverio.puccia.nfcauth.NFCAuthActivity}: java.lang.NullPointerException 06-25 11:03:23.670: E/AndroidRuntime(4323): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2456) 06-25 11:03:23.670: E/AndroidRuntime(4323): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2484) 06-25 11:03:23.670: E/AndroidRuntime(4323): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1998) 06-25 11:03:23.670: E/AndroidRuntime(4323): at android.app.ActivityThread.access$600(ActivityThread.java:127) 06-25 11:03:23.670: E/AndroidRuntime(4323): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1159) 06-25 11:03:23.670: E/AndroidRuntime(4323): at android.os.Handler.dispatchMessage(Handler.java:99) 06-25 11:03:23.670: E/AndroidRuntime(4323): at android.os.Looper.loop(Looper.java:137) 06-25 11:03:23.670: E/AndroidRuntime(4323): at android.app.ActivityThread.main(ActivityThread.java:4507) 06-25 11:03:23.670: E/AndroidRuntime(4323): at java.lang.reflect.Method.invokeNative(Native Method) 06-25 11:03:23.670: E/AndroidRuntime(4323): at java.lang.reflect.Method.invoke(Method.java:511) 06-25 11:03:23.670: E/AndroidRuntime(4323): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790) 06-25 11:03:23.670: E/AndroidRuntime(4323): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) 06-25 11:03:23.670: E/AndroidRuntime(4323): at dalvik.system.NativeStart.main(Native Method) 06-25 11:03:23.670: E/AndroidRuntime(4323): Caused by: java.lang.NullPointerException 06-25 11:03:23.670: E/AndroidRuntime(4323): at saverio.puccia.nfcauth.NFCAuthActivity.onResume(NFCAuthActivity.java:103) 06-25 11:03:23.670: E/AndroidRuntime(4323): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1157) 06-25 11:03:23.670: E/AndroidRuntime(4323): at android.app.Activity.performResume(Activity.java:4539) 06-25 11:03:23.670: E/AndroidRuntime(4323): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2446) 06-25 11:03:23.670: E/AndroidRuntime(4323): ... 12 more 06-25 11:03:23.670: W/ActivityManager(1998): Force finishing activity r.intent.getComponent().flattenToShortString()

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  • How to get the value of an item from database and set it as the spinner value

    - by kulPrins
    I have a database and the database populates a listview. when i long press a list item from the listview i get a context menu where i have the option to edit. When the edit option is clicked i open an activity and get all the values of the respective fields from the database. Now, here I want to get a value from the database and show it in the spinner. the spinner already has these values and is getting populated from the database... I have tried the following, but i get an error saying I can't cast a SimpleCursorAdapter to an ArrayAdapter.. String osub = cursor.getString(Database.INDEX_SUBJECT); Cursor cs = mDBS.querySub(osub); String subs = cs.getString(DatabaseSub.INDEX_SSUBJECT); if(cs!=null){ ArrayAdapter<String> myAdap = (ArrayAdapter<String>) subSpinner.getAdapter(); //cast to an ArrayAdapter int spinnerPosition = myAdap.getPosition(subs); //set the default according to value subSpinner.setSelection(spinnerPosition); Please tell me how to do this.. Thank you.. I am relatively new so please let me know if I am overlooking something. Thanks.. EDIT querySub method public Cursor querySub(String sub) throws SQLException { Cursor cursor = mDatabase.query(true, DATABASE_TABLE, sAllColumns, "ssub like " + "'" + sub + "'", null, null, null, null, null); if (cursor.moveToNext()) { return cursor; } cursor.moveToFirst(); return cursor; } Error Log 06-05 12:11:14.144: E/AndroidRuntime(775): FATAL EXCEPTION: main 06-05 12:11:14.144: E/AndroidRuntime(775): java.lang.RuntimeException: Unable to start activity ComponentInfo{an.droid.kit/an.droid.kit.DetailsActivity}: java.lang.ClassCastException: android.widget.SimpleCursorAdapter cannot be cast to android.widget.ArrayAdapter 06-05 12:11:14.144: E/AndroidRuntime(775): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 06-05 12:11:14.144: E/AndroidRuntime(775): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 06-05 12:11:14.144: E/AndroidRuntime(775): at android.app.ActivityThread.access$600(ActivityThread.java:123) 06-05 12:11:14.144: E/AndroidRuntime(775): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 06-05 12:11:14.144: E/AndroidRuntime(775): at android.os.Handler.dispatchMessage(Handler.java:99) 06-05 12:11:14.144: E/AndroidRuntime(775): at android.os.Looper.loop(Looper.java:137) 06-05 12:11:14.144: E/AndroidRuntime(775): at android.app.ActivityThread.main(ActivityThread.java:4424) 06-05 12:11:14.144: E/AndroidRuntime(775): at java.lang.reflect.Method.invokeNative(Native Method) 06-05 12:11:14.144: E/AndroidRuntime(775): at java.lang.reflect.Method.invoke(Method.java:511) 06-05 12:11:14.144: E/AndroidRuntime(775): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 06-05 12:11:14.144: E/AndroidRuntime(775): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 06-05 12:11:14.144: E/AndroidRuntime(775): at dalvik.system.NativeStart.main(Native Method) 06-05 12:11:14.144: E/AndroidRuntime(775): Caused by: java.lang.ClassCastException: android.widget.SimpleCursorAdapter cannot be cast to android.widget.ArrayAdapter 06-05 12:11:14.144: E/AndroidRuntime(775): at an.droid.kit.DetailsActivity.dbToUI(DetailsActivity.java:217) 06-05 12:11:14.144: E/AndroidRuntime(775): at an.droid.kit.DetailsActivity.onCreate(DetailsActivity.java:104) 06-05 12:11:14.144: E/AndroidRuntime(775): at android.app.Activity.performCreate(Activity.java:4465) 06-05 12:11:14.144: E/AndroidRuntime(775): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 06-05 12:11:14.144: E/AndroidRuntime(775): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 06-05 12:11:14.144: E/AndroidRuntime(775): ... 11 more

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  • why is my intent not useful?

    - by user1634887
    This is my first to ask here. I write the code for a Broadcast A start another Broadcast B. But the Broadcast B didn't get the intent's value. Broadcast A:get the sms contain message and start B public void onReceive(Context context, Intent intent) { Object[] pdus=(Object[])intent.getExtras().get("pdus"); for(Object pdu:pdus) { byte[] date=(byte[])pdu; SmsMessage message=SmsMessage.createFromPdu(date); String sender=message.getOriginatingAddress(); String body=message.getMessageBody(); if(sender.equals(AppUtil.herPhone)&&body.regionMatches(0, AppUtil.herSmsText, 0, 18)) { Toast.makeText(context, body, Toast.LENGTH_LONG).show(); String [] bodyArray=body.split(" "); String longitude=bodyArray[1]; String latitude=bodyArray[2]; **Intent uiIntent=new Intent(); Bundle bundle=new Bundle(); bundle.putString("longitude", longitude); bundle.putString("latitude", latitude); uiIntent.putExtras(bundle); uiIntent.setAction("android.janmac.location"); context.sendBroadcast(uiIntent);** abortBroadcast(); } } } Boardcast B: it nest in an Activity. register: button.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { AppUtil.SendMessage(MainActivity.this); uiReceiver=new UIReceiver(); IntentFilter filter=new IntentFilter(); filter.addAction("android.janmac.location"); registerReceiver(uiReceiver, filter); } }); extend: private class UIReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Log.v("location","uireceiver????!"); **Bundle bundle=new Bundle(); bundle=intent.getExtras(); herLongitude=Double.valueOf(bundle.getString("longitude")); herLatitude=Double.valueOf(bundle.getString("latitude"));** } } but the bundle couldn't get any values. here is log: 08-30 11:17:40.494: D/AndroidRuntime(2359): Shutting down VM 08-30 11:17:40.514: W/dalvikvm(2359): threadid=1: thread exiting with uncaught exception (group=0x40018560) 08-30 11:17:40.544: E/AndroidRuntime(2359): FATAL EXCEPTION: main 08-30 11:17:40.544: E/AndroidRuntime(2359): java.lang.RuntimeException: Error receiving broadcast Intent { act=android.janmac.location (has extras) } in com.example.locationclient.MainActivity$UIReceiver@40513690 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:722) 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.os.Handler.handleCallback(Handler.java:587) 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.os.Handler.dispatchMessage(Handler.java:92) 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.os.Looper.loop(Looper.java:130) 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.app.ActivityThread.main(ActivityThread.java:3835) 08-30 11:17:40.544: E/AndroidRuntime(2359): at java.lang.reflect.Method.invokeNative(Native Method) 08-30 11:17:40.544: E/AndroidRuntime(2359): at java.lang.reflect.Method.invoke(Method.java:507) 08-30 11:17:40.544: E/AndroidRuntime(2359): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864) 08-30 11:17:40.544: E/AndroidRuntime(2359): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622) 08-30 11:17:40.544: E/AndroidRuntime(2359): at dalvik.system.NativeStart.main(Native Method) 08-30 11:17:40.544: E/AndroidRuntime(2359): Caused by: java.lang.NumberFormatException 08-30 11:17:40.544: E/AndroidRuntime(2359): at org.apache.harmony.luni.util.FloatingPointParser.parseDblImpl(Native Method) 08-30 11:17:40.544: E/AndroidRuntime(2359): at org.apache.harmony.luni.util.FloatingPointParser.parseDouble(FloatingPointParser.java:283) 08-30 11:17:40.544: E/AndroidRuntime(2359): at java.lang.Double.parseDouble(Double.java:318) 08-30 11:17:40.544: E/AndroidRuntime(2359): at java.lang.Double.valueOf(Double.java:356) 08-30 11:17:40.544: E/AndroidRuntime(2359): at com.example.locationclient.MainActivity$UIReceiver.onReceive(MainActivity.java:231) 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:709) 08-30 11:17:40.544: E/AndroidRuntime(2359): ... 9 more enter code here

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  • raid md device is not remove from memory, how to overcome this problem

    - by santhosha
    i create raid 10 , i removed two arrays form md11 one by one , after that i going to editing the contents those are mounted ( it will be not responding stage), after i try for remove arrays those are left it is shows device or resource busy ( is not removed from memory). i try to terminate process this is also not work, i absorve from 4 days resync will be 8.0% it can not modifying. cat /proc/mdstat Personalities : [raid1] [raid0] [raid6] [raid5] [raid4] [linear] [raid10] md11 : active raid10 sde1[3] sdj14 286743936 blocks 64K chunks 2 near-copies [4/1] [___U] [1:2:3:0] [=...................] resync = 8.0% (23210368/286743936) finish=289392.6min speed=15K/sec mdadm -D /dev/md11 /dev/md11: Version : 00.90.03 Creation Time : Sun Jan 16 16:20:01 2011 Raid Level : raid10 Array Size : 286743936 (273.46 GiB 293.63 GB) Device Size : 143371968 (136.73 GiB 146.81 GB) Raid Devices : 4 Total Devices : 2 Preferred Minor : 11 Persistence : Superblock is persistent Update Time : Sun Jan 16 16:56:07 2011 State : active, degraded, resyncing Active Devices : 1 Working Devices : 1 Failed Devices : 1 Spare Devices : 0 Layout : near=2, far=1 Chunk Size : 64K Rebuild Status : 8% complete UUID : 5e124ea4:79a01181:dc4110d3:a48576ea Events : 0.23 Number Major Minor RaidDevice State 0 0 0 0 removed 1 0 0 1 removed 4 8 145 2 faulty spare rebuilding /dev/sdj1 3 8 65 3 active sync /dev/sde1 umount /dev/md11 umount: /dev/md11: not mounted mdadm -S /dev/md11 mdadm: fail to stop array /dev/md11: Device or resource busy lsof /dev/md11 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME mount 2128 root 3r BLK 9,11 4058 /dev/md11 mount 5018 root 3r BLK 9,11 4058 /dev/md11 mdadm 27605 root 3r BLK 9,11 4058 /dev/md11 mount 30562 root 3r BLK 9,11 4058 /dev/md11 badblocks 30591 root 3r BLK 9,11 4058 /dev/md11 kill -9 2128 kill -9 5018 kill -9 27605 kill -9 30562 kill -3 30591 mdadm -S /dev/md11 mdadm: fail to stop array /dev/md11: Device or resource busy lsof /dev/md11 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME mount 2128 root 3r BLK 9,11 4058 /dev/md11 mount 5018 root 3r BLK 9,11 4058 /dev/md11 mdadm 27605 root 3r BLK 9,11 4058 /dev/md11 mount 30562 root 3r BLK 9,11 4058 /dev/md11 badblocks 30591 root 3r BLK 9,11 4058 /dev/md11 cat /proc/mdstat Personalities : [raid1] [raid0] [raid6] [raid5] [raid4] [linear] [raid10] md11 : active raid10 sde1[3] sdj14 286743936 blocks 64K chunks 2 near-copies [4/1] [___U] [1:2:3:0] [=...................] resync = 8.0% (23210368/286743936) finish=289392.6min speed=15K/sec

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  • Fusion Middleware 11gR1 : 2012?4??????

    - by Hiro
    2012 ?4? (2012/04/17 ??)?Fusion Middleware 11gR1 ?????????????? ? ????????????4??????? 1. Oracle JDK??????Oracle JDK???????Oracle JRE/JDK 6 Update 31, Oracle JRE/JDK 7 Update 3 ??????? ???????????????Linux x86, Linux x86-64, Solaris (SPARC), Solaris x86-64, Windows (32-bit), Windows x64 ?????? 2. Oracle JRockit??????Oracle JRockit???????Oracle JRockit R28.2.2 ??????? ???????????????Linux x86, Linux x86-64, Solaris (SPARC), Windows (32-bit), Windows x64 ?????? 3. Oracle GlassFish ServerOracle GlassFish Server 3.1.2 ??????? ? ??????????????AIX, Linux x86, Linux x86-64, Solaris (SPARC), Solaris x86-64, Windows (32-bit), Windows x64, Other Platforms ?????? 4. Oracle Fusion Middleware 11.1.1.6.0?11.1.1.6.0?(Oracle WebLogic Server 10.3.6 ?????)?????????????????????AIX, Linux x86, Linux x86-64, Solaris (SPARC), Solaris x86-64, Windows (32-bit), Windows x64, Other Platforms ?????? ???????????????????????????????? Oracle Business Process Analysis Suite 11g (11.1.1.4.0) Oracle Directory Server Enterprise Edition 11g (11.1.1.5.0) Oracle Identity and Access Management 11g (11.1.1.5.0) OAM, OAAM, OIM ?? Oracle Identity Analytics 11g (11.1.1.5.0) Oracle Unified Directory 11g (11.1.1.5.0) Oracle Tuxedo 11g (11.1.1.2.0) or 11g (11.1.1.3.0) ?????Sun, ?FatWire??????? ???????????????11.1.1.6.0???????????????????????Oracle Fusion Middleware ?????????????????ReadMe 11g Release 1 (11.1.1.6.0)????????????Fixed Bug List????????????Note#1364511.1 ?????????? (Note????????????????????) ? ??????????????

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  • ??????????????!?Oracle Solaris 11.1 Day? ??????????

    - by OTN-J Master
    ????????????Oracle Solaris??20???????????? ?????????????????Oracle Solaris 11.1????????11????300???????????????????????????OS???????Oracle Database????????????????OS????????????????>> ???????? ?Oracle Solaris 11:??????OS? ???????11?30?(?)????????????Oracle Solaris 11.1 Day???????????????????????????????????????????????????????????????????????!???Solaris???????????????????????????????????Web??????????????????????????????????????????????????????Solaris 11??????????????????????????????????????????????????????????????????>>??????!????: 11?30?(?)13:00~15:30 (????12:30)?????: ???????? 13F???????(??????)???????  “The First Cloud OS” ???????Oracle Solaris 11??????????????????????????????????????????? IT ????????????????????????????????????????????????IT???????OS????????????????????Oracle OpenWorld 2012?????????Solaris11?????????????????????Solaris 11.1 ???????????????????Solaris????????????????????OS??Oracle?????????????????????????????????????Oracle Solaris????????????????????? ?????? ?13:30~13:40? ???????????????????????!???????????????????OS????????????????????? ???????????????? ?? ?? ? ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????IT????????????????????????????????????????????????????????????????????????????????????IT???????Enterprise??????????????????????? ?13:40~14:20?[??????????????]Oracle Solaris11.1 ?????????????????? ????????????? ??? ?“The First Cloud OS” ???????Oracle Solaris 11??????????????????????????????????????????? IT ??????????????????????????????????????????????????Oracle OpenWorld 2012?????????Solaris11?????????????????????Solaris 11.1 ???????????????? ?14:30~15:00?[?????????????????] ??????!Solaris 11 Beta ????????????????????   ???????   ? ?? ? ????????Oralce Solaris 11 Beta ?????????????????????????????????????????????15:00~15:20?[????????????????]Solaris 11 ?????????????????????? ??????????? ???????  ?? ?? Oracle University ?????????????????????????????????????????????????(Classroom Training)?????????????????????????????????????????????????????????Oracle University?????Solaris 11????????????????????? >> ??????????

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  • ubuntu: sem_timedwait not waking (C)

    - by gillez
    I have 3 processes which need to be synchronized. Process one does something then wakes process two and sleeps, which does something then wakes process three and sleeps, which does something and wakes process one and sleeps. The whole loop is timed to run around 25hz (caused by an external sync into process one before it triggers process two in my "real" application). I use sem_post to trigger (wake) each process, and sem_timedwait() to wait for the trigger. This all works successfully for several hours. However at some random time (usually after somewhere between two and four hours), one of the processes starts timing out in sem_timedwait(), even though I am sure the semaphore is being triggered with sem_post(). To prove this I even use sem_getvalue() immediately after the timeout, and the value is 1, so the timedwait should have been triggered. Please see following code: #include <stdio.h> #include <time.h> #include <string.h> #include <errno.h> #include <semaphore.h> sem_t trigger_sem1, trigger_sem2, trigger_sem3; // The main thread process. Called three times with a different num arg - 1, 2 or 3. void *thread(void *arg) { int num = (int) arg; sem_t *wait, *trigger; int val, retval; struct timespec ts; struct timeval tv; switch (num) { case 1: wait = &trigger_sem1; trigger = &trigger_sem2; break; case 2: wait = &trigger_sem2; trigger = &trigger_sem3; break; case 3: wait = &trigger_sem3; trigger = &trigger_sem1; break; } while (1) { // The first thread delays by 40ms to time the whole loop. // This is an external sync in the real app. if (num == 1) usleep(40000); // print sem value before we wait. If this is 1, sem_timedwait() will // return immediately, otherwise it will block until sem_post() is called on this sem. sem_getvalue(wait, &val); printf("sem%d wait sync sem%d. val before %d\n", num, num, val); // get current time and add half a second for timeout. gettimeofday(&tv, NULL); ts.tv_sec = tv.tv_sec; ts.tv_nsec = (tv.tv_usec + 500000); // add half a second if (ts.tv_nsec > 1000000) { ts.tv_sec++; ts.tv_nsec -= 1000000; } ts.tv_nsec *= 1000; /* convert to nanosecs */ retval = sem_timedwait(wait, &ts); if (retval == -1) { // timed out. Print value of sem now. This should be 0, otherwise sem_timedwait // would have woken before timeout (unless the sem_post happened between the // timeout and this call to sem_getvalue). sem_getvalue(wait, &val); printf("!!!!!! sem%d sem_timedwait failed: %s, val now %d\n", num, strerror(errno), val); } else printf("sem%d wakeup.\n", num); // get value of semaphore to trigger. If it's 1, don't post as it has already been // triggered and sem_timedwait on this sem *should* not block. sem_getvalue(trigger, &val); if (val <= 0) { printf("sem%d send sync sem%d. val before %d\n", num, (num == 3 ? 1 : num+1), val); sem_post(trigger); } else printf("!! sem%d not sending sync, val %d\n", num, val); } } int main(int argc, char *argv[]) { pthread_t t1, t2, t3; // create semaphores. val of sem1 is 1 to trigger straight away and start the whole ball rolling. if (sem_init(&trigger_sem1, 0, 1) == -1) perror("Error creating trigger_listman semaphore"); if (sem_init(&trigger_sem2, 0, 0) == -1) perror("Error creating trigger_comms semaphore"); if (sem_init(&trigger_sem3, 0, 0) == -1) perror("Error creating trigger_vws semaphore"); pthread_create(&t1, NULL, thread, (void *) 1); pthread_create(&t2, NULL, thread, (void *) 2); pthread_create(&t3, NULL, thread, (void *) 3); pthread_join(t1, NULL); pthread_join(t2, NULL); pthread_join(t3, NULL); } The following output is printed when the program is running correctly (at the start and for a random but long time after). The value of sem1 is always 1 before thread1 waits as it sleeps for 40ms, by which time sem3 has triggered it, so it wakes straight away. The other two threads wait until the semaphore is received from the previous thread. [...] sem1 wait sync sem1. val before 1 sem1 wakeup. sem1 send sync sem2. val before 0 sem2 wakeup. sem2 send sync sem3. val before 0 sem2 wait sync sem2. val before 0 sem3 wakeup. sem3 send sync sem1. val before 0 sem3 wait sync sem3. val before 0 sem1 wait sync sem1. val before 1 sem1 wakeup. sem1 send sync sem2. val before 0 [...] However, after a few hours, one of the threads begins to timeout. I can see from the output that the semaphore is being triggered, and when I print the value after the timeout is is 1. So sem_timedwait should have woken up well before the timeout. I would never expect the value of the semaphore to be 1 after the timeout, save for the very rare occasion (almost certainly never but it's possible) when the trigger happens after the timeout but before I call sem_getvalue. Also, once it begins to fail, every sem_timedwait() on that semaphore also fails in the same way. See the following output, which I've line-numbered: 01 sem3 wait sync sem3. val before 0 02 sem1 wakeup. 03 sem1 send sync sem2. val before 0 04 sem2 wakeup. 05 sem2 send sync sem3. val before 0 06 sem2 wait sync sem2. val before 0 07 sem1 wait sync sem1. val before 0 08 !!!!!! sem3 sem_timedwait failed: Connection timed out, val now 1 09 sem3 send sync sem1. val before 0 10 sem3 wait sync sem3. val before 1 11 sem3 wakeup. 12 !! sem3 not sending sync, val 1 13 sem3 wait sync sem3. val before 0 14 sem1 wakeup. [...] On line 1, thread 3 (which I have confusingly called sem1 in the printf) waits for sem3 to be triggered. On line 5, sem2 calls sem_post for sem3. However, line 8 shows sem3 timing out, but the value of the semaphore is 1. thread3 then triggers sem1 and waits again (10). However, because the value is already 1, it wakes straight away. It doesn't send sem1 again as this has all happened before control is given to thread1, however it then waits again (val is now 0) and sem1 wakes up. This now repeats for ever, sem3 always timing out and showing that the value is 1. So, my question is why does sem3 timeout, even though the semaphore has been triggered and the value is clearly 1? I would never expect to see line 08 in the output. If it times out (because, say thread 2 has crashed or is taking too long), the value should be 0. And why does it work fine for 3 or 4 hours first before getting into this state? This is using Ubuntu 9.4 with kernel 2.6.28. The same procedure has been working properly on Redhat and Fedora. But I'm now trying to port to ubuntu! Thanks for any advice, Giles

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  • Matplotlib plotting non uniform data in 3D surface

    - by Raj Tendulkar
    I have a simple code to plot the points in 3D for Matplotlib as below - from mpl_toolkits.mplot3d import axes3d import matplotlib.pyplot as plt import numpy as np from numpy import genfromtxt import csv fig = plt.figure() ax = fig.add_subplot(111, projection='3d') my_data = genfromtxt('points1.csv', delimiter=',') points1X = my_data[:,0] points1Y = my_data[:,1] points1Z = my_data[:,2] ## I remove the header of the CSV File. points1X = np.delete(points1X, 0) points1Y = np.delete(points1Y, 0) points1Z = np.delete(points1Z, 0) # Convert the array to 1D array points1X = np.reshape(points1X,points1X.size) points1Y = np.reshape(points1Y,points1Y.size) points1Z = np.reshape(points1Z,points1Z.size) my_data = genfromtxt('points2.csv', delimiter=',') points2X = my_data[:,0] points2Y = my_data[:,1] points2Z = my_data[:,2] ## I remove the header of the CSV File. points2X = np.delete(points2X, 0) points2Y = np.delete(points2Y, 0) points2Z = np.delete(points2Z, 0) # Convert the array to 1D array points2X = np.reshape(points2X,points2X.size) points2Y = np.reshape(points2Y,points2Y.size) points2Z = np.reshape(points2Z,points2Z.size) ax.plot(points1X, points1Y, points1Z, 'd', markersize=8, markerfacecolor='red', label='points1') ax.plot(points2X, points2Y, points2Z, 'd', markersize=8, markerfacecolor='blue', label='points2') plt.show() My problem is that I tried to make a decent surface plot out of these data points that I have. I already tried to use ax.plot_surface() function to make it look nice. For this I eliminated some points, and recalculated the matrix kind of input needed by this function. However, the graph I generated was far more difficult to interpret and understand. So there might be 2 possibilities: either I am not using the function correctly, or otherwise, the data I am trying to plot is not good for the surface plot. What I was expecting was 3D graph which would have an effect similar to that we have of 3D pie chart. We see that one piece (that which is extracted out) is part of another piece. I was not expecting it to be exactly same like that, but some kind of effect like that. What I would like to ask is: Do you think it will be possible to make such 3D graph? Is there any way better, I could express my data in 3 dimension? Here are the 2 files - points1.csv Dim1,Dim2,Dim3 3,8,1 3,8,2 3,8,3 3,8,4 3,8,5 3,9,1 3,9,2 3,9,3 3,9,4 3,9,5 3,10,1 3,10,2 3,10,3 3,10,4 3,10,5 3,11,1 3,11,2 3,11,3 3,11,4 3,11,5 3,12,1 3,12,2 3,13,1 3,13,2 3,14,1 3,14,2 3,15,1 3,15,2 3,16,1 3,16,2 3,17,1 3,17,2 3,18,1 3,18,2 4,8,1 4,8,2 4,8,3 4,8,4 4,8,5 4,9,1 4,9,2 4,9,3 4,9,4 4,9,5 4,10,1 4,10,2 4,10,3 4,10,4 4,10,5 4,11,1 4,11,2 4,11,3 4,11,4 4,11,5 4,12,1 4,13,1 4,14,1 4,15,1 4,16,1 4,17,1 4,18,1 5,8,1 5,8,2 5,8,3 5,8,4 5,8,5 5,9,1 5,9,2 5,9,3 5,9,4 5,9,5 5,10,1 5,10,2 5,10,3 5,10,4 5,10,5 5,11,1 5,11,2 5,11,3 5,11,4 5,11,5 5,12,1 5,13,1 5,14,1 5,15,1 5,16,1 5,17,1 5,18,1 6,8,1 6,8,2 6,8,3 6,8,4 6,8,5 6,9,1 6,9,2 6,9,3 6,9,4 6,9,5 6,10,1 6,11,1 6,12,1 6,13,1 6,14,1 6,15,1 6,16,1 6,17,1 6,18,1 7,8,1 7,8,2 7,8,3 7,8,4 7,8,5 7,9,1 7,9,2 7,9,3 7,9,4 7,9,5 and points2.csv Dim1,Dim2,Dim3 3,12,3 3,12,4 3,12,5 3,13,3 3,13,4 3,13,5 3,14,3 3,14,4 3,14,5 3,15,3 3,15,4 3,15,5 3,16,3 3,16,4 3,16,5 3,17,3 3,17,4 3,17,5 3,18,3 3,18,4 3,18,5 4,12,2 4,12,3 4,12,4 4,12,5 4,13,2 4,13,3 4,13,4 4,13,5 4,14,2 4,14,3 4,14,4 4,14,5 4,15,2 4,15,3 4,15,4 4,15,5 4,16,2 4,16,3 4,16,4 4,16,5 4,17,2 4,17,3 4,17,4 4,17,5 4,18,2 4,18,3 4,18,4 4,18,5 5,12,2 5,12,3 5,12,4 5,12,5 5,13,2 5,13,3 5,13,4 5,13,5 5,14,2 5,14,3 5,14,4 5,14,5 5,15,2 5,15,3 5,15,4 5,15,5 5,16,2 5,16,3 5,16,4 5,16,5 5,17,2 5,17,3 5,17,4 5,17,5 5,18,2 5,18,3 5,18,4 5,18,5 6,10,2 6,10,3 6,10,4 6,10,5 6,11,2 6,11,3 6,11,4 6,11,5 6,12,2 6,12,3 6,12,4 6,12,5 6,13,2 6,13,3 6,13,4 6,13,5 6,14,2 6,14,3 6,14,4 6,14,5 6,15,2 6,15,3 6,15,4 6,15,5 6,16,2 6,16,3 6,16,4 6,16,5 6,17,2 6,17,3 6,17,4 6,17,5 6,18,2 6,18,3 6,18,4 6,18,5 7,10,1 7,10,2 7,10,3 7,10,4 7,10,5 7,11,1 7,11,2 7,11,3 7,11,4 7,11,5 7,12,1 7,12,2 7,12,3 7,12,4 7,12,5 7,13,1 7,13,2 7,13,3 7,13,4 7,13,5 7,14,1 7,14,2 7,14,3 7,14,4 7,14,5 7,15,1 7,15,2 7,15,3 7,15,4 7,15,5 7,16,1 7,16,2 7,16,3 7,16,4 7,16,5 7,17,1 7,17,2 7,17,3 7,17,4 7,17,5 7,18,1 7,18,2 7,18,3 7,18,4 7,18,5

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  • Simple scan not working after upgrading to 12.10 (Xubuntu)

    - by mydoghasworms
    Since upgrading to 12.10 (Xubuntu), Simple Scan is not working anymore. I got scanning working with Xsane, but only if Simple Scan has not run before. Otherwise I have to restart the printer/scanner (HP OfficeJet J5783). In kernel.log I see: kernel: [ 1214.120964] usb 2-1.4: >usbfs: process 4412 (simple-scan) did not claim interface 2 before use and in syslog simple-scan: io/hpmud/dot4.c 172: unable to read Dot4ReverseCmd header: No data available simple-scan: io/hpmud/musb.c 1933: invalid Dot4Credit from peripheral simple-scan: io/hpmud/dot4.c 172: unable to read Dot4ReverseCmd header: No data available simple-scan: io/hpmud/musb.c 1933: invalid Dot4Credit from peripheral simple-scan: sane_hpaio_cancel: already cancelled! simple-scan: io/hpmud/dot4.c 172: unable to read Dot4ReverseCmd header: No data available simple-scan: io/hpmud/musb.c 1933: invalid Dot4Credit from peripheral simple-scan: io/hpmud/dot4.c 231: unable to read Dot4ReverseReply header: No data available bytesRead=0 simple-scan: io/hpmud/dot4.c 319: invalid DOT4InitReply retrying command... simple-scan: io/hpmud/dot4.c 172: unable to read Dot4ReverseCmd header: No data available simple-scan: io/hpmud/musb.c 1933: invalid Dot4Credit from peripheral simple-scan: io/hpmud/hpmud.c 342: device_cleanup: device uri=hp:/usb/Officejet_J5700_series?serial=CN81LCV0V604TC simple-scan: io/hpmud/hpmud.c 354: device_cleanup: close device dd=1... simple-scan: io/hpmud/hpmud.c 356: device_cleanup: done closing device dd=1 Any ideas?

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  • MYSQL not running on Ubuntu OS - Error 2002.

    - by mgj
    Hi, I am a novice to mysql DB. I am trying to run the MYSQL Server on Ubuntu 10.04. Through Synaptic Package Manager I am have installed the mysql version: mysql-client-5.1 I wonder that how was the database password set for the mysql-client software that I installed through the above way.It would be nice if you could enlighten me on this. When I tried running this database, I encountered the error given below: mohnish@mohnish-laptop:/var/lib$ mysql ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) mohnish@mohnish-laptop:/var/lib$ I referred to a similar question posted by another user. I didn't find a solution through the proposed answers. For instance when I tried the solutions posted for the similar question I got the following: mohnish@mohnish-laptop:/var/lib$ service start mysqld start: unrecognized service mohnish@mohnish-laptop:/var/lib$ ps -u mysql ERROR: User name does not exist. ********* simple selection ********* ********* selection by list ********* -A all processes -C by command name -N negate selection -G by real group ID (supports names) -a all w/ tty except session leaders -U by real user ID (supports names) -d all except session leaders -g by session OR by effective group name -e all processes -p by process ID T all processes on this terminal -s processes in the sessions given a all w/ tty, including other users -t by tty g OBSOLETE -- DO NOT USE -u by effective user ID (supports names) r only running processes U processes for specified users x processes w/o controlling ttys t by tty *********** output format ********** *********** long options *********** -o,o user-defined -f full --Group --User --pid --cols --ppid -j,j job control s signal --group --user --sid --rows --info -O,O preloaded -o v virtual memory --cumulative --format --deselect -l,l long u user-oriented --sort --tty --forest --version -F extra full X registers --heading --no-heading --context ********* misc options ********* -V,V show version L list format codes f ASCII art forest -m,m,-L,-T,H threads S children in sum -y change -l format -M,Z security data c true command name -c scheduling class -w,w wide output n numeric WCHAN,UID -H process hierarchy mohnish@mohnish-laptop:/var/lib$ which mysql /usr/bin/mysql mohnish@mohnish-laptop:/var/lib$ mysql ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) I even tried referring to http://forums.mysql.com/read.php?11,27769,84713#msg-84713 but couldn't find anything useful. Please let me know how I could tackle this error. Thank you very much..

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  • Opera 11 téléchargé 6,7 millions de fois le premier jour, des chiffres dépassant ceux de la bêta d'Internet Explorer 9

    Opera 11 téléchargé 6.7 millions de fois le premier jour, des chiffres dépassant ceux de la bêta d'Internet Explorer 9 Mise à jour du 18.12.2010 par Katleen Petite information, mais assez impressionnante pour qu'elle soit relayée : en à peine 24 heures de disponibilité, Opera 11, la dernière mouture du navigateur d'Opera Software équipé de quelques nouveautés, a été plus que largement téléchargé. Le logiciel a en effet été téléchargé 6.7 millions de fois en une journée ! C'est un record ! La version différente, Opera 10, n'avait été téléchargée que 1.7 millions de fois lors de sa première semaine d'exploitation. Pourquoi de tels résultats ? En partie grâce à l'auto-updat...

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  • SOA Suite 11g (11.1.1.3): Creating a single server domain with SOA Suite and Oracle Service Bus func

    - by Chris Tomkins
    One of the major benefits of the latest version of the Oracle SOA products, SOA Suite 11gR1 PS2 (11.1.1.3) and Oracle Service Bus 11gR1 (11.1.1.3), is that both products depend on the same version of WebLogic Server 11g (10.3.3) and so can be installed in the same domain. If you are a developer building artifacts for both but with a laptop/desktop with limited resources then this is particularly useful, as you can install a single server domain (by default you get a domain with an admin server and multiple managed servers) which incorporates both sets of functionality. The viewlet below shows you how to go about creating such a single server domain, using the configuration wizard. Just click the Play button from the viewlet menu to start it. Note: As you have added all this functionality into a single server, it will take a few minutes to start up. As this is my first foray into the world of viewlets I’d be interested in your opinion as to whether you have found this useful and any tips/techniques for improving any future viewlets I may create. Technorati Tags: soa suite,osb,viewlet,weblogic,domain

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  • Ubuntu 11.10 doesn't detect external usb hard drive

    - by Andrew
    I have been batting with this issue for a bit and cannot find the answer to it. So the Dmesg see's the device, being Symwave WDC WD64.... media@Media-pc:~$ dmesg | tail -n 20 [78678.719497] scsi 10:0:0:0: Direct-Access Generic- USB3.0 CRW -0 1.00 PQ: 0 ANSI: 0 CCS [78678.725621] scsi 10:0:0:1: Direct-Access Generic- USB3.0 CRW -1 1.00 PQ: 0 ANSI: 0 CCS [78684.073837] scsi 11:0:0:0: Direct-Access SYMWAVE WDC WD6400AAKS-0 3B01 PQ: 0 ANSI: 4 [78691.008126] scsi 11:0:0:0: uas_eh_abort_handler tag 0 [78691.008139] scsi 11:0:0:0: uas_eh_device_reset_handler tag 0 [78691.008147] scsi 11:0:0:0: uas_eh_target_reset_handler tag 0 [78691.008154] scsi 11:0:0:0: uas_eh_bus_reset_handler tag 0 [78691.080307] usb 2-2.4: reset high speed USB device number 9 using ehci_hcd [78691.221427] scsi 11:0:0:0: Device offlined - not ready after error recovery [78691.221498] scsi 11:0:0:0: rejecting I/O to offline device [78691.221519] scsi 11:0:0:0: rejecting I/O to offline device [78691.222952] scsi 11:0:0:1: Enclosure SYMWAVE SES 3B01 PQ: 0 ANSI: 4 [78691.223156] scsi 11:0:0:2: uas_sense_old: urb length 26 disagrees with IU sense data length 510, using 18 bytes of sense data [78691.225061] sd 11:0:0:0: Attached scsi generic sg3 type 0 [78691.225344] ses 11:0:0:1: Attached Enclosure device [78691.225495] ses 11:0:0:1: Attached scsi generic sg4 type 13 [78691.226266] sd 10:0:0:0: Attached scsi generic sg5 type 0 [78691.226653] sd 10:0:0:1: Attached scsi generic sg6 type 0 [78691.241647] sd 10:0:0:0: [sdd] Attached SCSI removable disk [78691.243832] sd 10:0:0:1: [sde] Attached SCSI removable disk It looks like it attaches sdd and sde. Now when i look in the disk utility it shows "Hard disk Symwave WD6400AAKS-0 device /dev/sdc doesn't show any other info then that, if i format, it says that it cannot open /dev/sdc no device or address error. Underneeth the device it does show two general usb3.0 CRW that are sdd and sde. Now if I do a fdisk -l it doesn't show the device: media@Media-pc:~$ sudo fdisk -l Disk /dev/sda: 80.0 GB, 80026361856 bytes 255 heads, 63 sectors/track, 9729 cylinders, total 156301488 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000247de Device Boot Start End Blocks Id System /dev/sda1 * 2048 152176639 76087296 83 Linux /dev/sda2 152178686 156301311 2061313 5 Extended /dev/sda5 152178688 156301311 2061312 82 Linux swap / Solaris Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x948fc822 Device Boot Start End Blocks Id System /dev/sdb1 63 1953520064 976760001 7 HPFS/NTFS/exFAT So now I am confused. Any ideas how I get fdisk to see the device?

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  • Solution for developers wanting to run a standalone WLS 10.3.6 server against JDev 11.1.1.6.0

    - by Chris Muir
    In my previous post I discussed how to install the 11.1.1.6.0 ADF Runtimes into a standalone WLS 10.3.6 server by using the ADF Runtime installer, not the JDeveloper installer.  Yet there's still a problem for developers here because JDeveloper 11.1.1.6.0 comes coupled with a WLS 10.3.5 server.  What if you want to develop, deploy and test with a 10.3.6 server?  Have we lost the ability to integrate the IDE and the WLS server where we can run and stop the server, deploy our apps automatically the server and more? JDeveloper actually solved this issue sometime back but not many people will have recognized the feature for what it does as it wasn't needed until now. Via the Application Server Navigator you can create 2 types of connections, one to a remote "standalone WLS" and another to an "integrated WLS".  It's this second option that is useful because what we can do is install a local standalone WLS 10.3.6 server on our developer PC, then create a separate "integrated WLS" connection to the standalone server.  Then by accessing your Application's properties through the Application menu -> Application Properties -> Run -> Bind to Integration Application Server option we can choose the newly created WLS server connection to work with our application. In this way JDeveloper will now treat the new server as if it was the integrated WLS.  It will start when we run and deploy our applications, terminate it at request and so on.  Of course don't forget you still need to install the ADF Runtimes for the server to be able to work with ADF applications. Note there is bug 13917844 lurking in the Application Server Navigator for at least JDev 11.1.1.6.0 and earlier.  If you right click the new connection and select "Start Server Instance" it will often start one of the other existing connections instead (typically the original IntegratedWebLogicServer connection).  If you want to manually start the server you can bypass this by using the Run menu -> Start Server Instance option which works correctly.

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  • Is there any advantage in using DX10/11 for a 2D game?

    - by David Gouveia
    I'm not entirely familiar with the feature set introduced by DX10/11 class hardware. I'm vaguely familiar with the new stages added to the programmable graphics pipeline, such as the geometry shader, the compute shader, and the new tesselation stages. I don't see how any of these make much of a difference for a 2D game though. Is there any compelling reason to make the switch to DX10/11 (or the OpenGL equivalents) for a 2D game, or would it be wiser to stick with DX9 considering that that a significant share of the market still runs on older technologies (e.g. the February 2012 Steam surveys lists around 17% of users as still using Windows XP)?

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  • How to fix Ubuntu 12.04.3 boot to black screen full of errors in white text, after upgrading on dell inspiron 1501

    - by Ibuntu
    I am running a Dell Inspiron 1501 I use Linux only. No Microsoft or Apple operating systems (or really anything closed-source). I've only been using Linux for a little over a year but I'm starting to gain a comfortable level of familiarity with the system and terminology. I've been having some issues with Quantel Quetzal and Raring Ringtail, especially with older hardware, so I opted to install Ubuntu 12.04.3 Precise Pangolin on the Inspiron 1501. I checked my MD5 sum after downloading my ISO and all was good. I have in fact used this iso/dvd to install Precise Pangolin successfully on a few other systems (some of which are even older than this laptop). Install goes fine. The wireless card doesn't work out of the box but this is a known issue which is fairly easy to fix. So, first thing I did was open up a terminal and run sudo apt-get update && sudo apt-get upgrade which, part way through, crashed (I assume lightdm and possibly X) and took me to a black screen filled with white lines of text that were either errors or just the ouputs of commands. The reason I say that is because I was unable to gleam any useful information from the output on the screen. I did take a picture however and will post a link. After that, every time I boot the system it goes right to that black screen posting all the error messages or output in white text. I never get a purple Ubuntu splash, so from what I can tell after reading this wiki article: https://wiki.ubuntu.com/X/Troubleshooting/BlankScreen That means that after the kernel is selected, it is unable to correctly implement the settings it needs. If the purple splash never shows, the frame buffer was never set correctly right? This leads me to believe that it could be a kernel issue? The wiki suggested to try and pinpoint the issue by rolling back kernels until I find one that works. Is this my best option? I think I'm going to give it a try anyways and will let everyone know if I am able to solve the issue this way. I have since done a few reinstalls and some trouble-shooting including a couple hours scouring the net for anyone with any kind of similar issue. Most of the issues I could find involved getting a black screen after login and none of them said anything about any information output on this black screen. My reinstalls have taught me that there is no issue updating, but as soon as I run sudo apt-get upgrade my system goes to the black screen and every time I boot it up it does the same thing. The only way to fix is by reinstall. I never get any ability to log in. After a hard power off to the laptop (because I cannot use ctrl+alt+del to reboot) when it boots again it goes to the grub boot menu and I can select between regular boot, recovery mode and the two memtest options. I never tried the memtest options but the other two both lead to the same black screen. Some people having a black/blank screen issue claim to have fixed it by using 12.10 or 13.04 but I believe they were having a different issue where they got a black/blank screen after logging in. I think I will still give these images a try, but mostly figured I would just wait another day or two for 13.10. Other things I figured I would try from the following three articles: After logging in, there's a black screen and my cursor, nothing else! in Ubuntu 12.10 Black Screen on Login After Upgrading to 12.04 I can't get to the login screen include opening a terminal using ctrl+alt+f1 and trying a variety of reseting unity, x settings, lightdm (or switching to gdm); but I doubt this will work or that I will even be able to access a terminal. I'm pretty sure the whole system is stuck after it loads the last line on the black screen. I will try these things and post more information when I have. Hopefully someone has an idea in the meantime and I will keep checking back trying to find a solution. Thank you. Here are 3 different pictures of the error message. I had to take with my phone: http://ubuntuone.com/album/0TBBkxmVajJIQQtoN9mVdN

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  • TechDays 2011 : Microsoft ouvre les inscriptions gratuites à son événement annuel qui se tiendra du 9 au 11 février à Paris

    TechDays 2011 : Microsoft ouvre les inscriptions gratuites à son événement annuel qui se tiendra du 9 au 11 février à Paris Rendez-vous incontournable des développeurs, décideurs et professionnels de l'informatique, les Microsoft TechDays rassemblent depuis bientôt 5 ans, et pendant 3 jours, plus de 17 000 visiteurs et 140 partenaires de l'écosystème Microsoft. La manifestation 2011 se déroule du 9 au 11 février au Palais des Congrès de Paris, sur une exposition de plus de 5 500m². Son également présents 150 journalistes et 300 experts techniques, conférenciers et démonstrateurs. Le programme se compose pour sa part de 330 conférences qui offr...

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  • Firefox 11 affiche la structure des pages web en 3D et les changements dans les feuilles de styles CSS en temps réel

    Firefox 11 affiche la structure des pages web en 3D Et les changements dans les feuilles de style CSS en temps réel Firefox 11 vient d'intégrer un ensemble d'améliorations qui risquent de ne pas laisser les développeurs web indifférents. La première nouveauté est un outil qui permet de visualiser la structure (CSS, etc.) d'une page en 3D. Page Inspector 3D View, surnommé Tilt, repose sur WebGL. « Cet outil permet à tout utilisateur de comprendre immédiatement le lien entre le code et la page finale », explique Mozilla. « Alors que les outils pour développeurs, tels que « view source », ont toujours été utiles pour apprendre à développer une page, l'affichage en 3D...

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  • Flash 11 : Adobe lance un programme d'incubation pour les développeurs, la « vraie 3D » arrive dans Flash Player

    Flash 11 : Adobe lance un programme d'incubation Pour les développeurs, la « vraie 3D » arrive dans Flash Player La devise : « sortir tôt et sortir vite », si chère à Google, séduit de plus en plus. Après Mozilla, c'est au tour d'Adobe de s'essayer aux cycles de développement plus courts centrés sur les fonctionnalités, avec son nouveau programme d'incubation pour Flash Player et Air. Ce programme devrait permettre aux développeurs de tester et de donner leurs feed-backs sur les nouvelles fonctionnalités des technologies Adobe très tôt dans leurs cycles de développement (avant la bêta habituelle, donc). Première nouveauté annoncée de Flash 11 : Moleh...

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  • La RC de Rails 3 repoussée au 11 juin et premières infos sur la version 3.1 du framework

    Mise à jour du 09/06/10 La RC de Rails 3 repoussée au 11 juin Et premières infos sur la version 3.1 du framework La RC du framework était attendue pour hier. Mais c'est une quatrième beta qui a fait son apparition. Des retards de dernières minutes ont empêché Rails 3 de sortir pendant la RailsConf qui se déroule actuellement à Baltimore, objectif initialement prévu par l'équipe de développement. Le fondateur du framework, David Heinemeier Hansson, reste cependant confiant puisque la RC devrait finalement arriver ce vendredi 11. Pour mémoire Rails 3 marque une avancée majeure pour la technologie. Cette ver...

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