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• How to play a fixed frequency sound using Python

  - by user98415

  I have tried a number of ways of playing a fixed frequency sound (e.g. 1000Hz) and nothing works. I have downloaded "beep" and that makes no noise. I tried interfacing to pyao, and that had no effect. I tried interfacing to audiere, and get a runtime error indicating the library could not be found, despite installing it from the software centre. Any guidance for installation of appropriate libraries and relevant code would be most appreciated. I cannot generate .mp3/ .wav files for this, but need to generate the tones at run time. Many thanks for you

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• usb keyboard stopped working in terminal window after update from 13.04 to 13.10

  - by Jim

  When I start the computer, I am logged in automatically. Using the keyboard, I type Ctrl+Alt+t, which brings up a terminal window, just like it should; however, nothing happens when I attempt to type into the terminal. If I change over to the guest account, I can type into the terminal, but (different problem here, I'll ask it separately unless someone is kind enough to answer it here) my password doesn't work for sudo or anything else. Elsewhere I read that Language support could fix it, but that won't accept my password either - and no, I haven't changed it lately. Also, my Plex Media Server seems to have disappeared. I'll re-install everything if necessary, but I sure would rather avoid that if possible

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• No sound card detected [elementary os]

  - by Silouane Gerin

  h61 I set up a computer for my parents with elementary os. I installed an Asus P8H61-I motherboard which contains an integrated Realtek ALC887 sound card. The system doesn't recognize the sound card. Here are the results of some commands: lspci | grep audio doesn't return anything, alsa force-reload return Unloading ALSA sound driver modules: (none loaded). Loading ALSA sound driver modules: (none to reload). aplay -l no soundcard detected and cat /proc/asound/cards let me know that asound doesn't exist. I tried installing Realtek drivers but nothing happened. Here is a log from alsa : Log Can someone help me? Thanks.

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• Many ui panels needs interaction with same object

  - by user877329

  I am developing a tool for simulating systems like the Gray-Scott model (That is systems where spatial distribution depends on time). The actual model is loaded from a DLL or shared object and the simulation is performed by a Simulation object. There are at least two situations when the simulation needs to be destroyed: The user loads a new model The user changes the size of the domain To make sure nothing goes wrong, the current Model, Simulation, and rendering Thread are all managed by an ApplicationState object. But the two cases above are initiated from two different UI objects. Is it then ok to distribute a reference to the ApplicationState object to all panels that need to access at least one method on the ApplicationState object? Another solution would be to use aggregation so that the panel from which the user chooses model knows the simulation parameter panel. Also, the ApplicationState class seems somewhat clumsy, so I would like to have something else

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• How do I get a Line6 UX1 soundcard to work?

  - by the_drow

  I own a Line6 UX1 soundcard and I would like to make it work for Ubuntu. I have followed the instructions here and it worked. But at some point I upgraded my kernel version (not sure what uname -a prints but it's related) and it stopped working. Here's what uname -a prints: Linux ubuntu 2.6.32-29-generic #58-Ubuntu SMP Fri Feb 11 20:52:10 UTC 2011 x86_64 GNU/Linux I figured out that maybe it's installed per version so I used svn update and hit make again. My guess was right as it copied the relevant files to the new version's folder. I restarted and still nothing. Should I revert to an older version? Or is there a solution here?

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• Why does the use of interface-based programming appear to be limited to behaviour?

  - by Carnotaurus

  I have been doing a little thinking about inheritance vs. realization vs. composition. I am not about to post the whole detail here. So I was wondering, when are not talking about supporting unit testing: Why does interface-based programming seem to focus upon the grouping of common behaviour, e.g., IPettable (for an animal), IEditable (for a user control), ISubmitable (for a form), etc. Why does the use of interface-based programming appear to be limited to behaviour when we could pragmatically group not so much on behaviour but on commonsense physical similarities which could have nothing to do with behaviour? It is not that there is some limiting feature within OOP; so how come?

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• wordpress get content main menu

  - by eca_arpit

  I added a menu page named "Home" on wp-admin. It was added successfully. when i click this home menu then it display nothing.Now i want to display content of a page suppose Page_id=15 on right side(which is empty after clicking home). 15 number page has php codes and uses a template also...is it possible to display contents..i wrote following code...if any confusion i can explain more..plz help me out.. i wrote this in a plugin. add_action('admin_menu', 'Home'); function Home() { add_menu_page('My Plugin Options', 'Home', 'manage_options', 'my-unique-identifier', 'content'); } function content() { if (!current_user_can('manage_options')) { wp_die( __('You do not have sufficient permissions to access this page.') ); } $page_id = 15; $header_content = get_page( $page_id ); echo apply_filters('the_content', $header_content-post_content); }

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• ASUS Xonar DG not working Ubuntu

  - by thephpdev

  I've checked the "Questions that may already have your answer" to no avail. Basically, there is no sound at all, the snd_oxygen drivers are all being loaded. I can see the sound card and all of it's separate ports in Settings-Sound-Output, but nothing is coming out. I tried adjusting the volume in alsamixer, but for some reason the volume won't change (all that is there are some options [Speakers, Headphones, FP Headphones] and they change when I press the up/down arrow keys) at all. I have also tried many other terminal commands, such as reloading alsa and checking if the sound card is even being detected, which it is. I'm left clueless. It says on a bug report that this has been unassigned for over a year. Surely that's not right. Thanks in advance, Caelan.

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• Unity freezes when laptop screen is closed

  - by Giacky98

  I have an Asus laptop running Ubuntu 12.04. It's configured to do nothing when the laptop screen is closed. But sometimes, when I close the screen and when I reopen it, after I move the mouse to reactivate the screen, my Unity interface is frozen and I can't click on anything. I can move the cursor, and if there's a music playing it keeps playing, but I can't click on anything. I can open a bash shell typing Ctrl+Alt+F2, but there I don't know what to do, I can only login and type sudo reboot to reboot the machine... Is there someone that has the same problem or that knows the solution?

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• How to make grub stop appearing every time I boot?

  - by Justin Riddiough

  I'm using Ubuntu 12.04 and grub selections appear each time I boot. This happens on both of my computers. I have tried editing the /etc/defaults/grub to use default, to use the 0 entry, and ran the update on it. But nothing seems to solve the problem. (showing uncommented lines) $ sudo nano /etc/default/grub GRUB_DEFAULT=0 GRUB_HIDDEN_TIMEOUT=0 GRUB_HIDDEN_TIMEOUT_QUIET=true GRUB_TIMEOUT=10 GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian` GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" GRUB_CMDLINE_LINUX="" $ sudo update-grub Generating grub.cfg ... Found linux image: /boot/vmlinuz-3.2.0-25-generic-pae Found initrd image: /boot/initrd.img-3.2.0-25-generic-pae Found linux image: /boot/vmlinuz-3.2.0-24-generic-pae Found initrd image: /boot/initrd.img-3.2.0-24-generic-pae Found memtest86+ image: /boot/memtest86+.bin No volume groups found done

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• OKI-B2540 printer doesn't print?

  - by NCLI

  There is a driver for the OKI-B2520, and it is automatically selected when the printer is connected. From looking at various websites, it seems like the B2500, B2520, and B2540 all work perfectly fine with the OKI-B2520 driver, so I let it install that. Everything went smoothly, the printer shows up as available, and I can queue jobs without any problems, and they disappear after a few seconds. However, nothing actually comes out. There is no error message on the printer display, or from Ubuntu. This is the output from the CUPS error log: http://pastebin.com/S6ifZAup So my question is: What is wrong??

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• Should I continue to learn and program using ansi c or non standard? [closed]

  - by Erik

  I am a Cs Student, enthusiastic about programming. C is my first programming language that I learned. (Never been exposed to programming, data structures, algorithms before) I failed the exam because I studied on my own and didn't know how to use windows non standard libraries like conio.h. (I had to draw circles, etc using get x and get y). I told them but they just don't care. What do I do because for a beginner this is very confusing? Do I continue to study ansi c on my own, or should I study non standard c? Should I do them in parallel? *I did use the search bar but found nothing useful that could help me.

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• adding pls to rhythmbox

  - by tomasz74

  I try to add .pls radio station to rhythmbox. I download the file and I click musicimport file but nothing happen. I added one station before and it works fine but now it simply does not work. Also when I try to get from the file, click on open with rhythmbox I have the error: Couldn't start playback Problem occurred without error being set. This is a bug in Rhythmbox or GStreamer. I have all medibuntu installed and I have one radio station already playing. I don't know how to proceed from now and what should I check if there is something to fix. Anyone get similar problem? (Ubuntu 12.04 64-bit Gnome3)

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• PLS HELP!!How to boot windows 7 after installing ubuntu 12.10?

  - by user113553

  Im new to linux and im interested in learning it so I installed ubuntu 12.10 yesterday. Installation went smoothly and i chose "install alongside windows option" and I set about 50 gb using that slider and i tot i used 50 gb from c: drive but to my shock it used 50 gb space from f: drive. This was my first shock.Then when i restarted n tried to log into windows, nothing happened a black screen appeared saying "To restart press alt+ctrl+delete" but even pressing that it wont restart. No matter how many times i try rebooting windows is not booting same black screen saying restart appears. But i can log in to ubuntu and i can see that windows c: drive is fine. PLEASE HELP ME!!!!

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• How are USB ports related to the computer power, and why would they cause my computer to freeze?

  - by BDuelz

  I have an issue with my new Toshiba laptop. Whenever I plug in an external USB device, if the laptop is not plugged in to the wall, the laptop freezes. However, nothing happens if the laptop is plugged in to the wall. When I say the laptop freezes, I mean it really freezes. The only way to recover is to hard reboot. My question is, what could be causing this? Could it be the extra power drain from the sub devices that causes this (even the simplest flash drives cause a freeze)? Please help me out, it's very annoying. Thanks

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• Empty Synchronized method in game loop

  - by Shijima

  I am studying the gameloop used in Replica Island to understand a bit about Android game development. The main loop has the below logic... GameThread.java (note the variable names in sample code dont match exact source code) while (!finished) { if (objectManager != null) { renderer.waitDrawingComplete(); //Do more gameloop stuff after drawing is complete... } } I was curious to see what waitDrawingComplete actually does, but found its just an empty syncrhonized method! I guess it does nothing, am I missing something here? GameRenderer.java line 328 public synchronized void waitDrawingComplete() { } Source code can be checked out here with SVN if you feel like having a look: https://code.google.com/p/replicaisland/source/checkout

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• xubuntu keyboard application shortcuts not working

  - by Guanidene

  I am using the latest Xubuntu 13.04 with Xfce 4.10. I have issues while setting "Application Shortucts' from 'Settings Manager Keyboard Application Shortcuts'. Not all custom keyboards shortcuts, which I have added, work. Some do, some don't. Example the command 'xdotool key XF86AudioPause' works perfect from cmdline, but not when I assign this as a shortcut to some key, say 'F11'. Have tried to Google about this, but found nothing. Kindly help. If possible, kindly provide me a cmdline way to set a keyboard shortcut

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• Pc won't start after installing latest version of ubuntu

  - by sotos bic

  Pc won't start after installing latest version of ubuntu . I press the button to start the pc and then i see the bios start but after that i get a black screen and nothing is happening. i can't even re install windows 7 or choose between windows 7 and linux . Please help i don't want to pay for fixing this . I don't remember the hardware and since i can't access windows 7 i can't tell you. the only thing that i know is that it is an hp compaq 500bmt

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• I need help pleas help me xorg.conf missing Ubuntu 11.10 can't install driver for my Intel GM965 on my Dell Latitude d630

  - by ??????? ?????????

  I have hard time solving my problem. I have searched the net but nothing worked... I just installed the newest ver of ubuntu 11.10 on my laptop dell latitude d630. Everything works fine but it seems i dont have my video card drivers installed. I have some standart drivers. I try to check out my xorg.conf file but its missing i try to make one from root but it gives me critical error. Its like i dont have X11 installed can some1 please help me here are some of the things ive tryed... """ splash@MDFC:/$ Xorg :1 -configure Fatal server error: Cannot open log file "/var/log/Xorg.1.log" Please consult the The X.Org Foundation support at http://wiki.x.org for help. ddxSigGiveUp: Closing log """ splash@MDFC:/$ sudo cp /root/xorg.conf.new /etc/X11/xorg.conf cp: cannot stat `/root/xorg.conf.new': No such file or directory """" Any ideas help me please...

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• Hadoop:Only master node does the work

  - by user287722

  I've setup a Hadoop 2.2 cluster with 1 master node(namenode and secondary namenode) and 3 slave nodes(datanode and namenode on each one).All of the machines use Linux Mint 64bit. When I run my MapReduce program, writen in Java, I can only see that master node is using extra CPU and RAM. Slave nodes are not doing a thing. I've checked the logs from all of the namenodes and there is nothing wrong with the namenodes on slave nodes. Resource Manager is running and all of the slave nodes can see the Resource Manager. I used this http://n0where.net/hadoop-2-2-multi-node-cluster-setup/ tutorial to configure my nodes. Datanodes are working in terms of distributed data storing but I can't see any indication of distributed data processing. Do I have to configure the xml configuration files in some other way so all of the machines will process data while I'm running my MapReduce Job?

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• Usb boot device totally unable to be formatted

  - by fuqda

  I'm really upset by now, I've been trying 2hours straight to format a stupid usb drive (I'm new to ubuntu and I dont know if I will last long at this rate) Basically this was the lubuntu boot usb key I tried to remove files with sudo rm I tried to format disk with disk utility I tried to format disk with gparted (with unmounting beforehand) NOTHING WORKS. I cant delete a file. I cant move a file to the usb key. I cant do anything. This is really infuriating.. I dont know what to do ? here are some gparted errors while trying to format to fat32 after unmounting error fsyncing/closing/dev/sdb: input/output error input/output error during write on /dev/sdb when I try to remove by hand, it says "read-only file"

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• Where are my Hard Drives/Local Disks on the COMPUTER/System Folder in Ubuntu 12.04?

  - by Russel

  Being first to try Ubuntu. But Where are my Hard Drives/Local Disks on the COMPUTER/System Folder in Ubuntu 12.04?! Before installing 12.04 i had tried the Ubuntu 10.10 Version Live and it was perfect in showing my Local Disks. But it couldn't recognize my GTX 470 Graphics driver so i thought of trying the recent version i.e 12.04. Fortunately it solved the Graphics driver thing but now i am stuck with finding My Local Disks on 12.04. I am sorry if this is a silly question, but i know nothing of Ubuntu at the moment. Regards,

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• Unable to empty the rubbish bin

  - by gman

  When I attempt to empty the rubbish bin the preparing window opens but nothing happens. In testing I tried to delete 1 file from the rubbish bin and received a time-out error. No files are removed from the rubbish bin after this. I have added a screen shot that includes a display of system monitor that shows high CPU usage for trash and Nautilus; not sure whether it is related. Click for a full-resolution image. Also, on a separated note, Bleachbit was also freezing on me, which may or may not be related?

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• How can I set the display resolution to 800x480?

  - by Oswaldo Barceló

  I have just installed Ubuntu 12.04 and I have a problem with it. My mini-laptop has a display resolution of 800x480, however Ubuntu seems to support only a resolution of 800x600. I have looked for a solution, but I have found nothing which works. So, how can I set the display resolution to 800x480? hey, hola a todos! Acabo de instalar Ubuntu 12.04 y en verdad me gusta mucho. pero aunque me guste bastante, tengo un pequeño gran problema, LA RESOLUCION DE MI PANTALLA!!! mi mini-laptop tiene una resolución de 800x480, pero Ubuntu viene con una por defecto de 800x600. en verdad me gustaria que me pudieran ayudar. llevo rato buscando una solucion, pero NADA!!! espero que me puedan ayudar!!! gracias de antemano!!! SALUDOS

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• Why does Bing not show my adcenter ads though there is enough space

  - by gamma

  I created several campaigns using the MS adcenter. I'm targeting the whole world at any time with 2-3 placement texts per keyword group. The bids I placed are sometimes quite high, so they should get displayed. When I try to search for my keywords in Bing nothing gets displayed, though there is plenty of space for it. Bing mostly displays 2-3 ads, but the ones at the right side rather seldom. I'd like to know, how I can improve the fact that my ads are not being displayed - without increasing the bids any further.

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