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Re: Alsa sound errors

On 05/06/13 21:31, Kailash wrote:

On Wed, 05 Jun 2013 07:24:16 -0700
Marc Shapiro <marcnshap@gmail.com> wrote:


On 06/04/2013 11:04 PM, Raffaele Morelli wrote:

2013/6/5 Marc Shapiro <marcnshap@gmail.com
<mailto:marcnshap@gmail.com>>

     There are three people with logins to my desktop box -- myself,
my wife and my daughter.  My daughter plays Flash games with sound
     all the time and has no problems.  I run YouTube videos and
     otherwise use sound with no problems.  My wife gets no sound
     whatsoever.  We used to have a problem with the sound being
     grabbed by something and then I would need to kill things
     manually, but I eliminated all KDE apps and that problem went
     away.  I think that was back when I was still running Etch,
     anyway.  When I need to verify that sound is working and not
     locked up, I just use 'play' with a .wav file.  My wife was just
     playing a video and getting no sound, so, under my login I ran:

     play /home/marc/public_html/footpain/media/montoya.wav

     /home/marc/public_html/footpain/media/montoya.wav:

      File Size: 14.8k     Bit Rate: 13.1k
       Encoding: GSM
       Channels: 1 @ 16-bit
     Samplerate: 8000Hz
     Replaygain: off
       Duration: 00:00:09.04

     In:100%  00:00:09.04 [00:00:00.00] Out:434k  [      |      ]
Clip:0 Done.

     and, as you can see, it worked just fine.

     So I swiched over to my wife's login and did the same thing:

      play /home/marc/public_html/footpain/media/montoya.wav
     ALSA lib pcm_dmix.c:985:(snd_pcm_dmix_open) unable to create IPC
     semaphore
     play FAIL formats: can't open output file `default':
snd_pcm_open error: Permission denied

     As you can see, it failed.  Can anyone tell me just what is
     failing and how to correct it.  My first thought was that it
was a permissions problem and perhaps she needed to be added to the
     'audio' group, or some such, as she is only in her own group.
But then I checked my daughter's account.  She is also only in her
own group; not in 'audio' or anything else.  So that ruled out that
     solution.  The error says 'Permission denied" however, so it is
     some kind of permissions problem, I just don't know what.

     Any help will be greatly appreciated.

     Marc


You should use
  ipc_key_add_uid TRUE

in your .asoundrc when defining dmix.

Details are in
http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html

Regards
/r

Is that a user lever file?  I do not find that config file anywhere
on my box.

Marc



Hi Marc,

Based on what R stated in reply-to Andrei, you need to try and reboot
your machine and log onto your wife's account. If the sound plays fine
then the issue is the one he described.

The .asoundrc file should be in the home directory of each user as
you're using ALSA to play sound. I've got PulseAudio on my system, so
can't check this for you.

K.
Searching the alsa-project.org website for ipc_key_add_uid indicates that this feature was removed before v 1.0.10 ? 
<http://www.alsa-project.org/main/index.php/Changes_1.0.9_v1.0.10>

+ Configuration
   - Summary: use ipc_gid for dmix and dsnoop
     - added ipc_gid audio
     - removed ipc_key_add_uid
The ~/.asoundrc file is not necessarily present by default, you need to create it manually if you want special control. 
<http://www.alsa-project.org/main/index.php/Asoundrc>

--
Klaus
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