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• Bad sound quality and headphones not working

  - by wifi

  Using Ubuntu 10.10, on a HP Pavilion t3019.es, which has a Realtek ALC880 soundcard. It has 6 rear jack outputs, plus digital audio input and output, plus 3 front jacks (mic, headphones and a blue one which i don't know what's for). The sound on my computer is very low, and when i raise the volume up to 50%, it starts sounding distorted, crackling. Also, the headphones don't work when i plug them (it just keeps on playing through the speakers). I tried to comment the "/etc/modprobe.d/alsa-base.conf" file according to the soundcard and jacks in my computer, but none of the lines added worked (naturally, didn't added them at once). I found out that adding "options snd-hda-intel model=generic" to it made the sound better, but it's not as good as in Windows yet. Any ideas? Other than setting the PCM value, didn't work for me. Thanks.

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• I want to increase the size of my boot partition (Ubuntu 14.04 version) [duplicate]

  - by Mike

  This question already has an answer here: How do I free up more space in /boot? 11 answers How to resize partitions? 5 answers I read in another post that kernels are distributed as new releases rather than upgrades. I didn't know this when I was allocating space to my partitions during my initial install of Ubuntu. As a result I ran out of space on my boot partition. Can I increase the size of it using GParted and how do I do this without doing damage to my system? 1 1049kB 512MB 511MB fat32 boot 2 512MB 768MB 256MB ext2 3 768MB 1000GB 999GB lvm Model: Linux device-mapper (linear) (dm) Disk /dev/mapper/ubuntu--vg-swap_1: 3712MB Sector size (logical/physical): 512B/4096B Partition Table: loop Number Start End Size File system Flags 1 0.00B 3712MB 3712MB linux-swap(v1) Model: Linux device-mapper (linear) (dm) Disk /dev/mapper/ubuntu--vg-root: 996GB Sector size (logical/physical): 512B/4096B Partition Table: loop Number Start End Size File system Flags 1 0.00B 996GB 996GB ext4 Sorry, don't know how to capture and post the terminal output screen.

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• nicstat update - version 1.92

  - by user12608033

  Another minor nicstat release is now available. Changes for Version 1.92, October 2012 Common Added "-M" option to change throughput statistics to Mbps (Megabits per second). Suggestion from Darren Todd. Fixed bugs with printing extended parseable format (-xp) Fixed man page's description of extended parseable output. Solaris Fixed memory leak associated with g_getif_list Add 2nd argument to dladm_open() for Solaris 11.1 Modify nicstat.sh to handle Solaris 11.1 Linux Modify nicstat.sh to see "x86_64" cputype as "i386". All Linux binaries are built as 32-bit, so we do not need to differentiate these two cpu types. Availability nicstat source and binaries are available from sourceforge. History For more history on nicstat, see my earlier entry

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• Unable to start GUI app from upstart

  - by novice

  As part of post-start of my app say "mydaemon" i want to launch a gui app say "mygui" I am unable to do this. I have verified user perm using xhost, DISPLAY variable is set correctly. conf file in /etc/init/ is given below me@ubuntu:~/term$ cat /etc/init/agentd.conf description "my daemon" author "me" start on runlevel [2345] stop on runlevel [016] console output kill timeout 60 respawn respawn limit 3 15 Allow some clean up time post-stop script env DISPLAY=:0.0 cd /home/me ./mygui sleep 1 end script script cd /home/me ./myapp end script post-start script env DISPLAY=:0.0 cd /home/me ./mygui end script sdn@ubuntu:~/term$ any suggestions?

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• Switching to an external display, when primary is broken

  - by Shazzner

  I've successfully install Ubuntu 11.10 Desktop (x86) on an old(er) laptop that unfortunately has a broken screen, so there is an external monitor plugged in. On the livecd it come up on the secondary display just fine and I was able to install ubuntu and everything. Unfortunately when I reboot into Ubuntu proper now, the secondary display is off and I'm literally driving blind here trying to switch it to the secondary display. Using Nvidia open source drivers. Things I've tried: Rebooting back into livecd, mounting the partition and trying in vain to find a config file (it uses the open source drivers so no Xorg.conf I could edit manually) Trying to blind-type xrandr settings into what I hope is terminal: xrandr --output VGA1 --auto (nothing happened) Trying to blind install openssh-server so I could ssh into it and maybe configure it from my working computer. For some reason though, no luck. Ubuntu really should default to expanding to all screens for this use case.

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• Baby's first big CPP project - please help [closed]

  - by jamesson

  So, I need to do a few things to the code here; http://64.90.55.88/SynapseSource-Win.zip What I need to do 1)remove the opengl output window 2)Make it work with latest openni (http://75.98.78.94/default.aspx) - as far as I could tell it only works with a specific older version 3)Improve ram and cpu usage (assuming I don't get what I need from the first two changes) 4)Eventually rebuild it as an object in this sdk; http://cycling74.com/products/sdk/ I tried going through the documentation, but "the needle could not penetrate", alas. For example, I am still unclear about some basic things; a) what are the relative responsibilities of nite vs openni? b) which xml files are always used when the app launches, and what is their format? Many thanks in advance Joe Stavitsky

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• List all versions of a package

  - by askb

  Is there a equivalent of this command; yum list kernel-headers --showduplicates on Ubuntu with apt-get, apt-cache etc. The above command lists various versions of the kernel-headers rpm available on F20/RHEL or installations. Closet I can get using apt-cache showpkg, not sure if there is a better way ? $ apt-cache showpkg linux-image Package: linux-image Versions: Reverse Depends: firmware-crystalhd,linux-image systemtap,linux-image fiaif,linux-image Dependencies: Provides: Reverse Provides: linux-image-3.13.0-27-lowlatency 3.13.0-27.50 linux-image-3.13.0-27-generic 3.13.0-27.50 linux-image-3.13.0-24-lowlatency 3.13.0-24.47 linux-image-3.13.0-24-generic 3.13.0-24.47 linux-image-3.13.0-24-lowlatency 3.13.0-24.46 linux-image-3.13.0-24-generic 3.13.0-24.46 Expecting similar output: $ yum list kernel-headers --showduplicates Loaded plugins: langpacks, refresh-packagekit Installed Packages kernel-headers.x86_64 3.11.10-301.fc20 @fedora Available Packages kernel-headers.x86_64 3.11.10-301.fc20 fedora kernel-headers.x86_64 3.14.4-200.fc20 updates This would help me simply do a downgrade or upgrade to a specific version.

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• juju: How do I list all the relation variables and debug them interactively?

  - by mfisch

  I'm writing a charm that requires a mysql database, I found from looking at other charms that this (below) is how I get the info about the database: user=`relation-get user` password=`relation-get password` mysqlhost=`relation-get private-address` But I just found that from reading the wordpress charm example, is there a way to show all the relation variables that I can use? Also, while debugging my db-relation-changed script, I wanted to ssh into my host and interactively run those commands, for example relation-get user, but it didn't work. I resorted to having to restart everything and use juju log to print them out. This wasted a lot of time. Is there a way to print out these relations, either from my dev box or from the instance running my charm? (Below is what happens when I tried to interactively run relation-get): ubuntu@mfisch-local-tracks-0:~$ relation-get user usage: relation-get [-h] [-o OUTPUT] [-s SOCKET] [--client-id CLIENT_ID] [--format FORMAT] [--log-file FILE] [--log-level CRITICAL|DEBUG|INFO|ERROR|WARNING] [-r RELATION ID] [settings_name] [unit_name] No JUJU_AGENT_SOCKET/-s option found

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• Scalability of multi-threading in game server

  - by Taylor Hill

  What is a reasonable number of threads for a simple 2D mmo in Java? Is it reasonable to have two threads per connection, one for the input stream and one for the output stream? The reason I ask is because I use a blocking method on the input stream, and a workaround seems unnecessarily complex if I were to try to get around it without adding threads. This is mostly for my own edification; I don't expect to have 5 million people playing it ever, or even 5, but I'm wondering what a good scalable solution is, and if this is reasonable for a small server (<30 connections).

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• kernel panic - diagnosis?

  - by user94188

  I'm having a kernel panic problem - my machine will run for hours, maybe all day and then have a panic attack. I have no idea how to interpret the output, but here's a picture of what's left on the screen when it happens: https://dl.dropbox.com/u/13279067/photo.JPG (I can't post images yet) I've looked through the logs but didn't find anything obvious - I'm still learning though so I've probably missed something. It's a little harder since it's always happened when I've been out or at night so I can't pinpoint the exact time it crashed. Anyone have advice? thanks

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• How to implement custom texture formats in Android?

  - by random1337

  What I know: Android can load PNG, BMP, WEBP,... via BitmapFactory. What I want to achive: Load my own 2D file format (e.g. 1-bit texture with a 1-bit alpha channel) and output a RGBA8888 texture. Question: Is there any interface to achieve this?(or any other way) The resulting image is used as a texture for a 3D model. Why would you do that? Saving phone memory and download bandwidth while expanding the texture at runtime to RAM seems reasonable for very simple textures.

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• Hiding array in apache_get_modules(); [closed]

  - by John Smiith

  i wan't to view all apache modules i use script below <?php $amods = apache_get_modules(); print_r($amods); This will output Array ( [1] => mod_win32 [2] => mpm_winnt [3] => http_core [4] => mod_so [5] => mod_actions [6] => mod_alias [7] => mod_asis [8] => mod_auth_basic [9] => mod_authn_default [10] => mod_authn_file ) how to hide array ( ... i want to apache get modules like this installed modules is mod_php5 mod_authn_default mod_userdir etc

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• No sound coming from HDMI

  - by cypwrx

  (Ubuntu 12.04 x64) After looking at other questions (here and other sites) and trying their respective answers, I am still unable to get the hdmi audio out working. I have downloaded the recommended hardware drivers for my card (radeon hd 4350), made sure that the card is not muted in alsamixer, and set it as the correct output device in sound settings. I have also disabled the onboard sound devices in the bios menu. In aplay -l, it shows my hdmi card as hw:0,3 Even after doing sound tests I still cannot hear anything. Any suggestions? Not sure where to go from here, I am fairly new to linux.

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• Compiling old versions of R (2.11 or older) on Ubuntu 13.10 (or newer)?

  - by user283293

  I am trying to compile an old version of R (2.11.1, specifically). "Why?", you might ask. Well, I have a program I am trying to run (that was not written by me, but I am hoping to use in my research) that was written in "old" R, and the program writer has specifically mentioned that R-2.11.1 or older must be used. I have run ./configure with no obvious errors (the entire output being far too long to post here, but I have been warned that I cannot make PDF, DVI, or HTML versions of the help pages, which I'm not too concerned about). Next, when I pass the make command, I am met with the following error (after a long stream of successful commands): Warning in solve.default(rgb): unable to load shared library '/home/sbowerma/Programs/R-2.11.1/modules//lapack.so': /home/sbowerma/Programs/R-2.11.1/lib/libRlapack.so: undefined symbol: _gfortran_compare_string Error in solve.default(rgb) : lapack routines cannot be loaded Error: unable to load R code in package 'grDevices' Execution halted However, I have confirmed that the library lapack.so is, in fact, in the exact position it is supposed to be.

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• No Sound via HDMI

  - by Goony Hill

  I have ubuntu installed on a Acer aspire revo 3700 intel atom processor with nvidia ion graphics this is plugged into a celcus 32 inch TV via HDMI (1080p). The video driver shows as an nvidia which I can select. I have set the sound to play via HDMI and the output to HDMI but get no sound. I have tried a sony 1080i TV with the box but get eratic results with the graphics, but the sound picks up straight away that is there is no need to select it. The graphics on the celcus TV work but I get a dialog box showing loads of different resolutions and frequencies which I have to close manually, these appear to be attempts to set different resolutions for the TV. Am I missing some sort of screen/sound driver, if so does anyone know what might support the celcus 32 inch (1080p) tv?

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• Screen Resolution Problem with Ubuntu 14.04 and VirtualBox

  - by user3341257

  Environment: Lenovo T530 running Windows 7. Have installed Ubuntu 14.04 on a virtual machine using VM Virtual Box. Have installed all the updates from both Virtual Box and Ubuntu. Problem: While in Ubuntu's desktop and other Ubuntu initiated programs, the window is reduced to about 3x4 inches showing in the middle of the rest of my regular Virtual Box window. I am seeing only the upper right hand of the screen output of what I would normally see. Please help. I've seen How do I install Guest Additions in a VirtualBox VM? But, none of these answers works in 14.04.

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• How can I build this payment receipt/booking application?

  - by Festus

  I'm planning to build a payment receipt/booking application for a media company with several branches in different locations. The application should be able to move data across the network/internet to a central database where the administrator/accountant in a different location will be able to see the result of the entire job for the day from each branch. Application will run on windows environment. Will be able to send result of the booking to a Point Of Sales printer for print output. Now, I'm confused about choosing the right programming language to accomplish this task. I'm between beginner/intermediate level in PHP, I know HTML/CSS and JavaScript. I have tried to do this in PHP but, I'm face with several challenges and I fear for the POS part since PHP application run on the web browser. I don't know if python will be best suited for this and how long will it take someone with my experience level to pick up python. Any suggestion will be highly appreciated.

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• How to make Ubuntu 14.04 run with less lag?

  - by King Shimkus

  I recently updated from Ubuntu 12.04 LTS to 14.04 LTS and for the first time it worked! However, whenever I move my mouse over an application icon on the unity shell, the animation takes forever to show me what the name of the application is ( A.k.a the tooltip ). The same happens with menus and sub-menus. Other than that, it is overall in general, slow. I just want to know if there are any tips to fix this or make my system faster. This is what it says when I type in glxinfo | grep renderer: GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer, OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.4, 128 bits) Output of lspci | grep VGA: 00:02.0 VGA compatible controller: Intel Corporation 82865G Integrated Graphics Controller (rev 02)

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• Tweaking Hudson memory usage

  - by rovarghe

  Hudson 3.1 has some performance optimizations that greatly reduces its memory footprint. Prior to this Hudson used to always hold the entire data model (all jobs and all builds) in memory which affected scalability. Some installations configured heap sizes in excess of 1GB to counteract this. Hudson 3.1.x maintains an MRU cache and only loads jobs and builds as they are required. Because of the inability to change existing APIs and be backward compatible with plugins, there were limits to how far we could go with this approach. Memory optimizations almost always come with a related cost, in this case its additional I/O that has to be performed to load data on request. On a small site that has frequent traffic, this is usually not noticeable since the MRU cache will usually hold on to all the data. A large site with infrequent traffic might experience some delays when the first request hits the server after a long gap. If you have a large heap and are able to allocate more memory, the cache settings can be adjusted to take advantage of this and even go back to pre-3.1 behavior. All the cache settings can be passed as options to the JVM container (Tomcat or the default Jetty container) using the -D option. There are two caches, independant of each other, one for Jobs and the other for Builds. For the jobs cache: hudson.jobs.cache.evict_in_seconds ( default=60 ) Seconds from last access (could be because of a servlet request or a background cron thread) a job should be purged from the cache. Set this to 0 to never purge based on time. hudson.jobs.cache.initial_capacity ( default=1024 ) Initial number of jobs the cache can accomodate. Setting this to the number of jobs you typically display on your Hudson landing page or home page will speed up consecutive access to that page. If the default is too large you may consider downsizing and using that memory for the Builds cache instead. hudson.jobs.cache.max_entries ( default=1024) Maximum number of jobs in the cache. The default is large enough for most installations, but if you find I/O activity when always accessing the hudson home page you might consider increasing this, but first verify if the I/O is caused by frequent eviction (see above), rather than by the cache not being large enough. For the builds cache: The builds cache is used to store Build objects as they are read from storage. Typically this happens when a user drills down into the details of a particular Job from the hudson hom epage. The cache is shared among builds for different jobs since in most installations all jobs are not accessed with the same frequency, so a per-job builds cache would be a waste of memory. hudson.job.builds.cache.evict_in_seconds ( default=60 ) Same as the equivalent Job cache, applied to Build. hudson.job.builds.cache.initial_capacity" ( default=512 ) Same as equivalent Job cache setting. Note the smaller initial size. If your site stores a large number of builds and has frequent access to more builds you might consider bumping this up. hudson.job.builds.cache.max_entries ( default=10240 ) The default max is large enough for most installations, the builds cache has bigger sized objects, so be careful about increasing the upper limit on this. See section on monitoring below. Sample usage: java -jar hudson-war-3.1.2-SNAPSHOT.war -Dhudson.jobs.cache.evict_in_seconds=300 \ -Dhudson.job.builds.cache.evict_in_seconds=300 Monitoring cache usage The 'jmap' tool that comes with the JDK can be used to monitor cache performance in an indirect way by looking at the number of Job and Build objects in each cache. Find the PID of the hudson instance and run $ jmap -histo:live <pid | grep 'hudson.model.*Lazy.*Key$' Here's a sample output: num #instances #bytes class name 523: 28 896 hudson.model.RunMap$LazyRunValue$Key 1200: 3 96 hudson.model.LazyTopLevelItem$Key These are the keys to the Jobs (LazyTopLevelItem$Key) and Builds (RunMap$LazyRunValue$Key) in the caches, so counting the number of keys is a good indicator of the number of items in the cache at any given moment. The size in bytes can be ignored, they are just the size of the keys, not the actual sizes of the objects they hold. Those sizes can only be obtained with a profiler. With the output above we can conclude that there are 3 jobs and 28 builds in memory. The 28 builds can all be from 1 job or all 3 jobs. Over time on an idle system, these should get evicted and memory cache should be empty. In practice, because of background cron threads and triggers, jobs rarely fall down to zero. Access of a job or a build by a cron thread resets the eviction timer.

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• Developing a search algorithm

  - by Richart Bremer

  I want to create a basic search engine, and I want you to give me some ideas how to filter out the best results for my visitors. I have three fields regarding a product the user can search in: Title Category Description I came up with these ideas and I ask you to either competently criticize them or add to them. If the search term occurs in all three fields it should be among the first results. If it is in two of the fields it is below the results of 1. Combine the amount of occurences and output a value in per cent. For instance if in all fields together the term clock appeared 50 times and in all fields together there are 200 words, then the per cent value is 50/200*100 = 25%. Another product entry amounts to say 20% so product one having 25% is listed before product two having 20%.

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• can't chmod on external hard disk?

  - by G. He

  I have an USB3.0 external hard disk, partitioned to 3 NTFS partitions. When I plug the hard disk in, the 3 partitions automatically mounted under /media. So far so good. I can read and write to files, or mkdir, etc on these partitions. But I can't do chmod/chown on any of the files/directories on these partitions. The owner:group always myself, and the mode are always 700 for directories and 600 for files. I have another partition on internal harddisk also mounted. That partition works fine. I looked the output of mount command, the only difference between mount options is that there is one extra 'default_permissions' on the external hard disks. Anyway I can set the owner:group and mode on these files and directories.

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• Ubuntu Server - Virtual Box?

  - by user186144

  So I got VirtualBox just for Ubuntu Server, I'm currently Running Ubuntu 12.04 as my main OS. But when I got everything set up in Ubuntu Server 12.04, including my ports forwarded and a test Minecraft server up... I realized that nobody could join my public IP I sent out, not even me! I can connect to the ipv4 address. It acts like I didn't forward my ports. But I forwarded 25565 to Input and Output and they're both TCP and UDP. Is this just a virtual box issue or am I doing something wrong? * Using Eth0 wired connection

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• W520 External monitor setup with Ubuntu 12.10

  - by user108372

  I just installed a fresh Ubuntu 12.10 64-Bit Desktop on my Lenovo W520. It looks like there are a lot of challenges around making it work with out of the box Nouveau drivers or propriety Nvidia drivers or Intel GPU. I looked at couple of notes on how to make it work with Bumblebee with Optimus Nvidia. None of them seems to work for 12.10. Anybody has a solid answer on this? It seems like a lot of people are suffering from this. Here is my xrandr output. Let me know if you need any additional information. Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192 LVDS1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 193mm 1920x1080 60.0*+ 59.9 50.0 1680x1050 60.0 59.9 1600x1024 60.2 1400x1050 60.0 1280x1024 60.0 1440x900 59.9 1280x960 60.0 1360x768 59.8 60.0 1152x864 60.0 1024x768 60.0 800x600 60.3 56.2 640x480 59.9 VGA1 disconnected (normal left inverted right x axis y axis) Thanks, Sef

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• Getting wireless N to work on Dell Vostro 3300?

  - by luisfpg

  I have a Dell Vostro 3300, which has a Broadcom BCM4313 wireless. The point is that I cannot make it work in N mode. NetwotkManager applet says I'm on 54 Mbit/s. Of course, my wireless router is N capable. I've double checked. Anyone knows what to do? Here is the output for lspci -v: 12:00.0 Network controller: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller (rev 01) Subsystem: Dell Device 0010 Flags: bus master, fast devsel, latency 0, IRQ 17 Memory at fbb00000 (64-bit, non-prefetchable) [size=16K] Capabilities: <access denied> Kernel driver in use: wl Kernel modules: wl, brcm80211 Thanks a lot.

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• No Windows Option on Boot

  - by Okoning

  I've installed Ubuntu alongside Windows but at first didn't have a boot option menu. So, I installed bootrepair and ran it. This succeeded in granting me a GRUB boot option menu, but Windows isn't on it. Here is the bootrepair report: http://paste.ubuntu.com/8098527 Can anyone tell me what might be wrong? EDIT: I ran sudo fdisk -l and this is the output: Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 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: 0x00023fe0 Device Boot Start End Blocks Id System /dev/sda1 * 2048 960096255 480047104 83 Linux /dev/sda2 960098302 976771071 8336385 5 Extended /dev/sda5 960098304 976771071 8336384 82 Linux swap / Solaris Disk /dev/sdb: 32.0 GB, 32015679488 bytes 255 heads, 63 sectors/track, 3892 cylinders, total 62530624 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: 0x00000000 Device Boot Start End Blocks Id System /dev/sdb1 * 32 62530623 31265296 c W95 FAT32 (LBA)

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