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  • Extend university wifi network [migrated]

    - by asfasdoiuh ouhouhouh
    i live in a university campus and i can get wifi signal on the outside of my window but not in the house. The solution i use at the moment is a usb wifi dongle outside connected to my laptop but the lack of an internal antenna make the connection quite unreliable at times. So i was trying to find another solution to improve the reception of my network. One idea is to setup a router on the outside (in a place with stronger signal) and redirect the connection inside the house with an ethernet cable but the problem is that our Uni Wifi is managed by a capitve portal (BlueSocket with DNS redirection to login page) and the authentication has to happen on the mac address that connect to the net (so the client appliance in this case). If I use a router with Mac-Clone capability i will be able to be redirected trough the captive portal on my laptop computer and login from there or i need to setup my router to fill in the login page by itself? There are other hardware/software solutions i can use to get what i want? Thank you all

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  • Win XP cannot connect (or see) my wifi network, but can see others

    - by Jorre
    since yesterday I have a strange wifi problem with my pc. I have a wireless linksys router setup that worked fine for many months, now since yesterday my pc won't connect to the wifi signal anymore. The strange thing is, my macbook pro still connects fine. SSID is broadcasting, but my windows XP doens't see it, I have all signal modes set to "auto". Windows XP sees all my neighbours wifi networks, so the wifi card isn't broken or anything. Any idea what can be wrong here?

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  • Extend university wifi network

    - by asfasdoiuh ouhouhouh
    i live in a university campus and i can get wifi signal on the outside of my window but not in the house. The solution i use at the moment is a usb wifi dongle outside connected to my laptop but the lack of an internal antenna make the connection quite unreliable at times. So i was trying to find another solution to improve the reception of my network. One idea is to setup a router on the outside (in a place with stronger signal) and redirect the connection inside the house with an ethernet cable but the problem is that our Uni Wifi is managed by a capitve portal (BlueSocket with DNS redirection to login page) and the authentication has to happen on the mac address that connect to the net (so the client appliance in this case). If I use a router with Mac-Clone capability i will be able to be redirected trough the captive portal on my laptop computer and login from there or i need to setup my router to fill in the login page by itself? There are other hardware/software solutions i can use to get what i want?

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  • Is it better to use a crowded 2.4GHz Wi-Fi channel 1, 6, 11 or "unused" 3, 4, 8, or 9?

    - by Luke
    I understand that 2.4GHz Wi-Fi channels overlap, and that the only non-overlapping channels in the US are 1, 6, and 11. Generally, my signal strength on channels 1, 6, and 11 are much stronger than my neighbors' on the same channel. However, several of the channels may have 4 or 5 others on that same channel. In this scenario, is it better to use 3, 4, 8, or 9? Or is it better to use the crowded channels 1, 6, and 11? As a secondary question, does it even matter that my signal strength is much higher than theirs? Related: Why use wifi channels other than 1, 6 or 11?

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  • UPS compatible with Linux box?

    - by Somebody still uses you MS-DOS
    I'm buying this unit from deal extreme: it's a bitorrent downloader, with NAS capability. I'm interested in sharing an external HD in it, with media and backup purposes. I'm afraid of energy problems (don't know if this is the correct term), corrupting my mounted drives (like after a storm), so I thought about buying an UPS that sends a "signal" to my Linux box, and a script in my Linux box would unmout everything to avoid problems. Do this "UPS signal" feature exists? Do you have model suggestions? Thanks!

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  • Is 50% download speed on a wireless G network normal?

    - by Bartlomiej Skwira
    I have a wired connection of about 36Mb/s, but my wireless speed is max at about 18-19Mb/s. I have a WRT54G-TM (T-Mobile, 802.11G) router with DD-WRT firmware - I've upgraded it to latest build. Done some settings changes: changed channel - 13 wireless network mode - G-only ACK Timing - 0 Fragmentation Threshold and RTS Threshold - 2304 Basic Rate - All Signal/Noise ratio: -46/-94, signal quality ~50-60%. Is this normal with G networks? Edit: The AP is located about 2 meters from laptop, no walls or metal objects, but its next to a TV. I've done a channel scan (had problems locating it, go to "Status - Wireless - Site survey" - lame naming) and everybody else is on channels 1 and 6. Switched to channel 11 but it didn't help. As for trasmit power I got best results with default 71mw. The antenna might be a factor, I'm using the default 2 antennas.

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  • What can cause a black or blank screen when pressing logout or switch user in windows 7

    - by Medran
    The situation I have here is related to a brand new dell machine with a GTX260 video card. Put simply after one user logs in when that user either 'switch users' or 'logs out' windows goes to a black/blank screen. The TV screen that is used with this computer previously functioned fine with fast user switching on an XP machine. The new computer is windows 7. The TV is not outputting any error messages like 'no signal' or anything else that would be displayed if the computer was off. You can fix the problem by cycling the input on television, after cycling the input the welcome screen appears as normal. What I want to know is what on earth is windows doing that would cause the video card to stop sending the same signal to the monitor when the user logs off or switches users. I mean as far as I can tell the resolution is identical between windows and the welcome screen. Or perhaps if somebody has experienced this before a fix would be great too.

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  • mysql_close doesn't kill locked sql requests

    - by Nikita
    I use mysqld Ver 5.1.37-2-log for debian-linux-gnu I perform mysql calls from c++ code with functions mysql_query. The problem occurs when mysql_query execute procedure, procedure locked on locked table, so mysql_query hangs. If send kill signal to application then we can see lock until table is locked. Create the following SQL table and procedure CREATE TABLE IF NOT EXISTS `tabletolock` ( `id` INT NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id`) )ENGINE = InnoDB; DELIMITER $$ DROP PROCEDURE IF EXISTS `LOCK_PROCEDURE` $$ CREATE PROCEDURE `LOCK_PROCEDURE`() BEGIN SELECT id INTO @id FROM tabletolock; END $$ DELOMITER; There are sql commands to reproduce the problem: 1. in one terminal execute lock tables tabletolock write; 2. in another terminal execute call LOCK_PROCEDURE(); 3. In first terminal exeute show processlist and see | 2492 | root | localhost | syn_db | Query | 12 | Locked | SELECT id INTO @id FROM tabletolock | Then perfrom Ctrl-C in second terminal to interrupt our procudere and see processlist again. It is not changed, we already see locked select request and can teminate it by unlock tables or kill commands. Problem described is occured with mysql command line client. Also such problem exists when we use functions mysql_query and mysql_close. Example of c code: #include <iostream> #include <mysql/mysql.h> #include <mysql/errmsg.h> #include <signal.h> // g++ -Wall -g -fPIC -lmysqlclient dbtest.cpp using namespace std; MYSQL * connection = NULL; void closeconnection() { if(connection != NULL) { cout << "close connection !\n"; mysql_close(connection); mysql_thread_end(); delete connection; mysql_library_end(); } } void sigkill(int s) { closeconnection(); signal(SIGINT, NULL); raise(s); } int main(int argc, char ** argv) { signal(SIGINT, sigkill); connection = new MYSQL; mysql_init(connection); mysql_options(connection, MYSQL_READ_DEFAULT_GROUP, "nnfc"); if (!mysql_real_connect(connection, "127.0.0.1", "user", "password", "db", 3306, NULL, CLIENT_MULTI_RESULTS)) { delete connection; cout << "cannot connect\n"; return -1; } cout << "before procedure call\n"; mysql_query(connection, "CALL LOCK_PROCEDURE();"); cout << "after procedure call\n"; closeconnection(); return 0; } Compile it, and perform the folloing actions: 1. in first terminal local tables tabletolock write; 2. run program ./a.out 3. interrupt program Ctrl-C. on the screen we see that closeconnection function is called, so connection is closed. 4. in first terminal execute show processlist and see that procedure was not intrrupted. My question is how to terminate such locked calls from c code? Thank you in advance!

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  • Wireless with WEP extremely slow on an Acer Timeline 4810T with a Centrino Wireless-N 1000

    - by noq38
    I've upgraded an Acer Timeline 4810T to Ubuntu 11.10. Everything works fine except for the darn wireless interface (network manager). I just tested the wireless interface over a non-encrypted signal and it works beautifully. The issue is definitely related to WEP. Unfortunately, some of the networks I need to connect to are WEP encrypted, therefore this is a serious issue for me that is preventing me from using Ubuntu on my laptop. This was no problem in 11.04 and prior. Is there a simple solution for this? Any suggestions? Here's more hardware information. Hopefully this helps to debug the network issue: sudo lshw -class network *-network description: Wireless interface product: Centrino Wireless-N 1000 vendor: Intel Corporation physical id: 0 bus info: pci@0000:02:00.0 logical name: wlan0 version: 00 serial: 00:1e:64:3c:5e:e0 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=iwlagn driverversion=3.0.0-13-generic-pae firmware=39.31.5.1 build 35138 latency=0 link=no multicast=yes wireless=IEEE 802.11bgn resources: irq:43 memory:d2400000-d2401fff lspci 02:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000 rfkill list 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no 1: acer-wireless: Wireless LAN Soft blocked: no Hard blocked: no Many thanks for your help! I just tested the wireless interface over a non-encrypted signal and it works beautifully. The issue is definitely related to WEP. Unfortunately, some of the networks I need to connect to are WEP encrypted, therefore this is a serious issue for me that is preventing me from using Ubuntu on my laptop. Any suggestions?

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  • How to install the latest version of google earth on ubuntu 12.10 64-bit?

    - by user114769
    Chris here with a huge problem with the Google earth latest version. Gosh.. whenever I try to lunch the app this comes out. I'v Tried this web site nothing worked: (THANK YOU SO MUCH FOR EVEN READING THIS. MAY YOU GUYS HAVE A NICE DAY. christopher@christopher-E4300:~$ google-earth Google Earth has caught signal 11. We apologize for the inconvenience, but Google Earth has crashed. This is a bug in the program, and should never happen under normal circumstances. A bug report and debugging data have been written to this text file: /home/christopher/.googleearth/crashlogs/crashlog-50cbd67e.txt Please include this file if you submit a bug report to Google. https://help.ubuntu.com/community/GoogleEarth#Installing_the_.deb_file_downloaded_from_the_Google_Earth_Website Here is the content of /home/christopher/.googleearth/crashlogs/crashlog-50cbd67e.txt Major Version 7 Minor Version 0 Build Number 0001 Build Date Oct 29 2012 Build Time 19:13:39 OS Type 3 OS Major Version 3 OS Minor Version 5 OS Build Version 0 OS Patch Version 0 Crash Signal 11 Crash Time 1355535998 Up Time 0.789556 Stacktrace from glibc: ./libgoogleearth_free.so(+0x1e9cfb)[0xf757dcfb] ./libgoogleearth_free.so(+0x1e9f43)[0xf757df43] [0xf7726400]

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  • TV Antenna Helper Makes HDTV Antenna Calibration a Snap

    - by ETC
    If you’re rocking an Android device, TV Antenna Helper is a free tool that will help you orient your HDTV antenna for best signal strength. The free (ad-supported) application checks your location and lists all the HDTV stations within range. You can check signal strength, use compass bearings to help align the antenna with the stations you want to tune, and check additional information about the station and your orientation to it. It’s the kind of tool you won’t need everyday but when trotted out will save you tons of time and aggravation. Hit up the link below for more information and to grab a free copy for your Android device. TV Antenna Helper [Android Market via Addictive Tips] Latest Features How-To Geek ETC Learn To Adjust Contrast Like a Pro in Photoshop, GIMP, and Paint.NET Have You Ever Wondered How Your Operating System Got Its Name? Should You Delete Windows 7 Service Pack Backup Files to Save Space? What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? How To Make Hundreds of Complex Photo Edits in Seconds With Photoshop Actions Awesome 10 Meter Curved Touchscreen at the University of Groningen [Video] TV Antenna Helper Makes HDTV Antenna Calibration a Snap Turn a Green Laser into a Microscope Projector [Science] The Open Road Awaits [Wallpaper] N64oid Brings N64 Emulation to Android Devices Super-Charge GIMP’s Image Editing Capabilities with G’MIC [Cross-Platform]

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  • What causes critical glib errors (when coding using messaging menu)?

    - by fluteflute
    If I run the python code below (almost entirely from this useful blog post) then I get three identical nasty looking error messages in the terminal. What might be causing them? I note the number (5857 in the example below) changes slightly on each run. What does this number signify? Is it a memory location or something similar? (messaging-menu.py:5857): GLib-GIO-CRITICAL **: g_dbus_method_invocation_return_dbus_error: assertion `error_name != NULL && g_dbus_is_name (error_name)' failed (messaging-menu.py:5857): GLib-GIO-CRITICAL **: g_dbus_method_invocation_return_dbus_error: assertion `error_name != NULL && g_dbus_is_name (error_name)' failed (messaging-menu.py:5857): GLib-GIO-CRITICAL **: g_dbus_method_invocation_return_dbus_error: assertion `error_name != NULL && g_dbus_is_name (error_name)' failed I'm running this on Natty, I should probably find out if I get the same errors in 10.10 though... import gtk def show_window_function(x, y): print x print y # get the indicate module, which does all the work import indicate # Create a server item mm = indicate.indicate_server_ref_default() # If someone clicks your server item in the MM, fire the server-display signal mm.connect("server-display", show_window_function) # Set the type of messages that your item uses. It's not at all clear which types # you're allowed to use, here. mm.set_type("message.im") # You must specify a .desktop file: this is where the MM gets the name of your # app from. mm.set_desktop_file("/usr/share/applications/nautilus.desktop") # Show the item in the MM. mm.show() # Create a source item mm_source = indicate.Indicator() # Again, it's not clear which subtypes you are allowed to use here. mm_source.set_property("subtype", "im") # "Sender" is the text that appears in the source item in the MM mm_source.set_property("sender", "Unread") # If someone clicks this source item in the MM, fire the user-display signal mm_source.connect("user-display", show_window_function) # Light up the messaging menu so that people know something has changed mm_source.set_property("draw-attention", "true") # Set the count of messages in this source. mm_source.set_property("count", "15") # If you prefer, you can set the time of the last message from this source, # rather than the count. (You can't set both.) This means that instead of a # message count, the MM will show "2m" or similar for the time since this # message arrived. # mm_source.set_property_time("time", time.time()) mm_source.show() gtk.main()

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  • Best practice with pyGTK and Builder XML files

    - by Phoenix87
    I usually design GUI with Glade, thus producing a series of Builder XML files (one such file for each application window). Now my idea is to define a class, e.g. MainWindow, that inherits from gtk.Window and that implements all the signal handlers for the application main window. The problem is that when I retrieve the main window from the containing XML file, it is returned as a gtk.Window instance. The solution I have adopted so far is the following: I have defined a class "Window" in the following way class Window(): def __init__(self, win_name): builder = gtk.Builder() self.builder = builder builder.add_from_file("%s.glade" % win_name) self.window = builder.get_object(win_name) builder.connect_signals(self) def run(self): return self.window.run() def show_all(self): return self.window.show_all() def destroy(self): return self.window.destroy() def child(self, name): return self.builder.get_object(name) In the actual application code I have then defined a new class, say MainWindow, that inherits frow Window, and that looks like class Main(Window): def __init__(self): Window.__init__(self, "main") ### Signal handlers ##################################################### def on_mnu_file_quit_activated(self, widget, data = None): ... The string "main" refers to the main window, called "main", which resides into the XML Builder file "main.glade" (this is a sort of convention I decided to adopt). So the question is: how can I inherit from gtk.Window directly, by defining, say, the class Foo(gtk.Window), and recast the return value of builder.get_object(win_name) to Foo?

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  • recent unreliable wireless connection on 10.04 and 10.10

    - by gabkdlly
    Recently, my internet connection over wireless has become unreliable, on both a Dell laptop running Ubuntu 10.04 as well as my Desktop running Ubuntu 10.10 . The problem does not seem to occur on a laptop running Windows Vista. The problem does not seem to occur on my Openmoko Freerunner ( running Android 1.5 ), though I hardly ever use this device to connect over WLAN, so the problem may have just slipped by. This problem does not seem to appear when I boot into Ubuntu 9.10 from a live CD ( more precisely, I was able to ping fu-berlin.de for an hour without any packet loss ). Under Ubuntu 10.10, I am experiencing about 33% packet loss. On my main Ubuntu Desktop, I have tried the following wireless devices: a Longshine PCI card ( an old device with an RTL8180L chip ) a D-Link DWL-510 PCI card ( this device threw warnings in dmesg ) a USB device from MSI ( US54EX ). Usually my wireless network shows up in the network manager with a normal signal strength, even when the connection speed is slow ( which happens often ) or the connection gets reset ( asking me to click connect to re-authenticate my wireless connection ). I have observed this problem with a Netgear KWGR614 Router ( with the manufacturers firmware ), as well as with a TP-LINK TL-WR741ND router running OpenWrt. Taking a look at my routers logs, I find many instances of the following line: Tuesday,04 Jan 2011 03:53:01 [TCP SYN Flood][Deny access policy matched, dropping packet] I know that the Netgear router is susceptible to denial of service attacks, as I have previously been able to disrupt its operation by putting an nmap scan into a while loop. I use WEP on the Netgear router and WPA on the TP-LINK to encrypt the wireless connections. Is it possible that someone is jamming my signal ?

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  • Intel 5100 AGN disconnects and then disables my Verizon FiOS Actiontec router

    - by Anthony
    I am a new user (my first trial) of Ubuntu and booted up my Windows Vista laptop up with the Ubuntu CD. I was able to connect wirelessly to my router and stay connected for about a minute. After that it would disconnect and my router would be disabled: none of my other wireless devices would see the signal any longer, as if it disappeared. I would have to cycle the router's power toggle off/on to get it to come back on and put out a signal again. This happened repeatedly. I experienced no other problems trying the software (i.e., accessed my files w/o issue). I did not attempt to connect with an Ethernet cable. Here are the specs on my system: laptop is HP Pavilion dv5 Notebook PC system type is 64-bit operating system CPU is Intel Core 2 Duo P8600 2.4GHz ram is 4 GB network card is Intel WiFi Link 5100 AGN I read elsewhere in this forum that 64-bit systems may not be compatible with Ubuntu. Can anyone help me with this? I'd really like to be able to use this op system.

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  • Why, when on Kubuntu I lose internet connection, am I unable to reconnect?

    - by Jonathan
    Using Kubuntu 11.10. Sony Vaio computer. Network controller: Intel Corporation WiFi Link 5100. If I connect to a wireless network, and the signal drops, then I am unable to connect to any network without a reboot. I can assure that the issue has nothing to do with the computer going to sleep, as I have experienced the above while using my computer continuously. Here is exactly what happens: Connect to network (at University, where the connection is not so great). The connection is broken There are three other possible networks available, but none of them can be connected to. I have tried off and on sometimes for hours. I am always able to reestablish a connection after a reboot. I can only think of two explanations. The first is that a temp file is corrupted when the internet connection is abruptly dropped. The second is that my computer actually corrupts something before the loss of internet connection, which causes the loss in signal, and inability to reconnect. However, I am not confident that my explanations are complete, nor do I have any idea how to test these things.

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  • recent unreliable wireless connection with Netgear KWGR614 router

    - by gabkdlly
    Recently, my internet connection over wireless ( via a Netgear KWGR614 router ) has become unreliable, on both a Dell laptop running Ubuntu 10.04 as well as my Desktop running Ubuntu 10.10 . The problem does not seem to occur on a laptop running Windows Vista, nor on a Desktop running Windows 7 ( this machine is connected with an ethernet cable ). The problem does not seem to occur on my Openmoko Freerunner ( running Android 1.5 ), though I hardly ever use this device to connect over WLAN, so the problem may have just slipped by. On my main Ubuntu Desktop, I have tried the following wireless devices: a Longshine PCI card ( an old device with an RTL8180L chip ) a D-Link DWL-510 PCI card ( this device threw warnings in dmesg ) a USB device from MSI ( US54EX ). Usually my wireless network shows up in the network manager with a normal signal strength, even when the connection speed is slow or the connection gets reset ( asking me to click connect to re-authenticate my wireless connection ). I know that this router is susceptible to denial of service attacks, as I have previously been able to disrupt its operation by putting an nmap scan into a while loop. Is it possible that someone is jamming my signal ?

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  • Internet Timeouts with TP-Link TL-WN821N v2 wireless usb stick

    - by user1622959
    A short time after accessing the internet, the browser/download times out. Before the timeout, the internet works OK briefly; afterwards, the wireless is still connected with a strong signal, but every internet access results in a timeout. When I leave the PC for a while, the internet is back just to timeout again as soon as I start using it. The same happens when I reconnect to the router. Also, when I surf the internet, it takes a couple of minutes until the timeout, but when I download something, it times out in a matter of seconds. The wireless adapter works just fine in Windows and internet via ethernet cable works just fine in Ubuntu. Does anyone have the same problem or knows a solution. I use Ubuntu 12.10 x64. The problem occurs since I installed ubuntu (which was a few days ago). Here some stuff that might be usefull: serus@serus-Ubuntu-PC:~$ lsusb Bus 002 Device 002: ID 0cf3:1002 Atheros Communications, Inc. TP-Link TL-WN821N v2 802.11n [Atheros AR9170] serus@serus-Ubuntu-PC:~$ lsmod Module Size Used by carl9170 82083 0 serus@serus-Ubuntu-PC:~$ modinfo carl9170 filename: /lib/modules/3.5.0-21- generic/kernel/drivers/net/wireless/ath/carl9170/carl9170.ko alias: arusb_lnx alias: ar9170usb firmware: carl9170-1.fw description: Atheros AR9170 802.11n USB wireless serus@serus-Ubuntu-PC:~$ iwconfig wlan0 IEEE 802.11bgn ESSID:"virginmedia0137463" Mode:Managed Frequency:2.462 GHz Access Point: A0:21:B7:F8:29:B6 Bit Rate=240 Mb/s Tx-Power=20 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=66/70 Signal level=-44 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:1399 Invalid misc:18 Missed beacon:0 serus@serus-Ubuntu-PC:~$ sudo lshw -C network *-network description: Wireless interface physical id: 1 bus info: usb@2:2 logical name: wlan0 serial: 00:27:19:bb:00:19 capabilities: ethernet physical wireless configuration: broadcast=yes driver=carl9170 driverversion=3.5.0-21-generic firmware=1.9.4 ip=192.168.0.6 link=yes multicast=yes wireless=IEEE 802.11bgn

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  • How to apply verification and validation on the following example

    - by user970696
    I have been following verification and validation questions here with my colleagues, yet we are unable to see the slight differences, probably caused by language barrier in technical English. An example: Requirement specification User wants to control the lights in 4 rooms by remote command sent from the UI for each room separately. Functional specification The UI will contain 4 checkboxes labelled according to rooms they control. When a checkbox is checked, the signal is sent to corresponding light. A green dot appears next to the checkbox When a checkbox is unchecked, the signal (turn off) is sent to corresponding light. A red dot appears next to the checkbox. Let me start with what I learned here: Verification, according to many great answers here, ensures that product reflects specified requirements - as functional spec is done by a producer based on requirements from customer, this one will be verified for completeness, correctness). Then design document will be checked against functional spec (it should design 4 checkboxes..), and the source code against design (is there a code for 4 checkboxes, functions to send the signals etc. - is it traceable to requirements). Okay, product is built and we need to test it, validate. Here comes our understanding trouble - validation should ensure the product meets requirements for its specific intended use which is basically business requirement (does it work? can I control the lights from the UI?) but testers will definitely work with the functional spec, making sure the checkboxes are there, working, labelled, etc. They are basically checking whether the requirements in functional spec were met in the final product, isn't that verification? (should not be, lets stick to ISO 12207 that only validation is the actual testing)

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  • How do I require use of the 5 GHz band when connecting to a Wireless N access point?

    - by cqcallaw
    What is says in the topic: there's a Wireless N access point to which I'd like to connect using the 5 GHz band exclusively. How does one accomplish this? Using the directive band=a in the connection configuration file in /etc/NetworkManager/system-connections doesn't seem to affect anything (/var/log/syslog still shows attempts by wpa_supplicant to connect using the 2.4 GHz band), and running iwconfig wlan0 freq 5G per this question results in the following error: Error for wireless request "Set Frequency" (8B04) : SET failed on device wlan0 ; Invalid argument. [Edit] I'm hoping the answer won't depend on the hardware in use, but here's some information about the hardware, just in case: System is an Asus ZenBook Prime UX31A-DB51, running Ubuntu 12.04. lspci output: 00:00.0 Host bridge: Intel Corporation Ivy Bridge DRAM Controller (rev 09) 00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09) 00:04.0 Signal processing controller: Intel Corporation Device 0153 (rev 09) 00:14.0 USB controller: Intel Corporation Panther Point USB xHCI Host Controller (rev 04) 00:16.0 Communication controller: Intel Corporation Panther Point MEI Controller #1 (rev 04) 00:1a.0 USB controller: Intel Corporation Panther Point USB Enhanced Host Controller #2 (rev 04) 00:1b.0 Audio device: Intel Corporation Panther Point High Definition Audio Controller (rev 04) 00:1c.0 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 1 (rev c4) 00:1c.1 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 2 (rev c4) 00:1d.0 USB controller: Intel Corporation Panther Point USB Enhanced Host Controller #1 (rev 04) 00:1f.0 ISA bridge: Intel Corporation Panther Point LPC Controller (rev 04) 00:1f.2 SATA controller: Intel Corporation Panther Point 6 port SATA Controller [AHCI mode] (rev 04) 00:1f.3 SMBus: Intel Corporation Panther Point SMBus Controller (rev 04) 00:1f.6 Signal processing controller: Intel Corporation Panther Point Thermal Management Controller (rev 04) 02:00.0 Network controller: Intel Corporation Centrino Advanced-N 6235 (rev 24) The driver for the wireless interface is iwlwifi.

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  • recent unreliable wireless connection

    - by gabkdlly
    Recently, my internet connection over wireless ( via a Netgear KWGR614 router ) has become unreliable, on both a Dell laptop running Ubuntu 10.04 as well as my Desktop running Ubuntu 10.10 . The problem does not seem to occur on a laptop running Windows Vista, nor on a Desktop running Windows 7 ( this machine is connected with an ethernet cable ). The problem does not seem to occur on my Openmoko Freerunner ( running Android 1.5 ), though I hardly ever use this device to connect over WLAN, so the problem may have just slipped by. On my main Ubuntu Desktop, I have tried the following wireless devices: a Longshine PCI card ( an old device with an RTL8180L chip ) a D-Link DWL-510 PCI card ( this device threw warnings in dmesg ) a USB device from MSI ( US54EX ). Usually my wireless network shows up in the network manager with a normal signal strength, even when the connection speed is slow or the connection gets reset ( asking me to click connect to re-authenticate my wireless connection ). I have observed this problem with a Netgear KWGR614 Router ( with the manufacturers firmware ), as well as with a TP-LINK TL-WR741ND router running OpenWrt. Taking a look at my routers logs, I find many instances of the following line: Tuesday,04 Jan 2011 03:53:01 [TCP SYN Flood][Deny access policy matched, dropping packet] I know that the Netgear router is susceptible to denial of service attacks, as I have previously been able to disrupt its operation by putting an nmap scan into a while loop. I use WEP or WPA to encrypt the wireless network. Is it possible that someone is jamming my signal ?

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  • Configuring an Engenius 3500

    - by dsiddens
    The title speaks to only half of the issue: the other half are the settings in Ubuntu and the sequences therein. The computer in this issue does receive internet with the external antenna jack at the back being fed with a simple magnetic base antenna designed for putting on the roof of an automobile. However, that signal is weak and the Engenius with an external antenna (Rootenna ~15db gain) and ehternet wire will supply a stronger, faster signal. I've set the Engenius to the desired source and entered the correct WEP password. The lights on the Engenius indicate that it's connected to the access point. At the Ubuntu side of this I've worked to no avail changing settings with "Edit Connections" to the point I'm Ask(ing)Ubuntu for help. I have and have RTFM for Engenius 3500 There is an embarrassing side note to this issue: At one time I had the Engenius working! It seems that I can't recall the settings and sequences I used way back when. And I may as well confess to not knowing the Command Line. I'm a GUI guy. Thank you for your time, Doug

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  • Installing nVidia drivers for Quadro FX 880M on 10.10 caused shutdown/startup issues.

    - by Chantz
    So I was facing weird graphics drivers issues due to the default nouveau drivers that came installed with Ubuntu 10.10 hence I installed the latest nVidia graphics drivers & I the weird graphics issues stopped happening. So far so good, but when I tried to shut down the laptop it got stuck at the window with text 15, shutting down... modem-manager: Caught signal 15, shutting down... init: Disconnected from system us init: dbus main process (1107) killed by TERM signal And this happens .everytime.without.fail. I tried updating the kernel and any/all drivers through update manager but it stil happens. Not only this even the startup screen is totally screwed up. It just displays Ubuntu 10.10 in text with 3 dots. But that is acceptable. To power cycle down the laptop each and everytime for shutdown is not cool. Same goes for when I try to restart. Interesting thing is if I try to shutdown the laptop when I am on the login screen it does so without any problems. I googled & many people seem to face the same issue but I couldn't find any silver bullet hoping to find one here.

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  • SQL SERVER – Single Wait Time Introduction with Simple Example – Wait Type – Day 2 of 28

    - by pinaldave
    In this post, let’s delve a bit more in depth regarding wait stats. The very first question: when do the wait stats occur? Here is the simple answer. When SQL Server is executing any task, and if for any reason it has to wait for resources to execute the task, this wait is recorded by SQL Server with the reason for the delay. Later on we can analyze these wait stats to understand the reason the task was delayed and maybe we can eliminate the wait for SQL Server. It is not always possible to remove the wait type 100%, but there are few suggestions that can help. Before we continue learning about wait types and wait stats, we need to understand three important milestones of the query life-cycle. Running - a query which is being executed on a CPU is called a running query. This query is responsible for CPU time. Runnable – a query which is ready to execute and waiting for its turn to run is called a runnable query. This query is responsible for Single Wait time. (In other words, the query is ready to run but CPU is servicing another query). Suspended – a query which is waiting due to any reason (to know the reason, we are learning wait stats) to be converted to runnable is suspended query. This query is responsible for wait time. (In other words, this is the time we are trying to reduce). In simple words, query execution time is a summation of the query Executing CPU Time (Running) + Query Wait Time (Suspended) + Query Single Wait Time (Runnable). Again, it may be possible a query goes to all these stats multiple times. Let us try to understand the whole thing with a simple analogy of a taxi and a passenger. Two friends, Tom and Danny, go to the mall together. When they leave the mall, they decide to take a taxi. Tom and Danny both stand in the line waiting for their turn to get into the taxi. This is the Signal Wait Time as they are ready to get into the taxi but the taxis are currently serving other customer and they have to wait for their turn. In other word they are in a runnable state. Now when it is their turn to get into the taxi, the taxi driver informs them he does not take credit cards and only cash is accepted. Neither Tom nor Danny have enough cash, they both cannot get into the vehicle. Tom waits outside in the queue and Danny goes to ATM to fetch the cash. During this time the taxi cannot wait, they have to let other passengers get into the taxi. As Tom and Danny both are outside in the queue, this is the Query Wait Time and they are in the suspended state. They cannot do anything till they get the cash. Once Danny gets the cash, they are both standing in the line again, creating one more Single Wait Time. This time when their turn comes they can pay the taxi driver in cash and reach their destination. The time taken for the taxi to get from the mall to the destination is running time (CPU time) and the taxi is running. I hope this analogy is bit clear with the wait stats. You can check the single wait stats using following query of Glenn Berry. -- Signal Waits for instance SELECT CAST(100.0 * SUM(signal_wait_time_ms) / SUM (wait_time_ms) AS NUMERIC(20,2)) AS [%signal (cpu) waits], CAST(100.0 * SUM(wait_time_ms - signal_wait_time_ms) / SUM (wait_time_ms) AS NUMERIC(20,2)) AS [%resource waits] FROM sys.dm_os_wait_stats OPTION (RECOMPILE); Higher the single wait stats are not good for the system. Very high value indicates CPU pressure. In my experience, when systems are running smooth and without any glitch the single wait stat is lower than 20%. Again, this number can be debated (and it is from my experience and is not documented anywhere). In other words, lower is better and higher is not good for the system. In future articles we will discuss in detail the various wait types and wait stats and their resolution. Read all the post in the Wait Types and Queue series. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, PostADay, SQL, SQL Authority, SQL DMV, SQL Performance, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, SQL Wait Stats, SQL Wait Types, T SQL, Technology

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