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Re: Audio problem

Nigel Henry wrote:
On Wednesday 11 February 2009 22:08, JD wrote:
Dear list,
I am running FC7, kernel
It has been fine for more than 2 years.
Yesterday, the audio stopped working.
I thought it was the HW.
I booted into WinXP and tested the audio,
Audio was fine.

How do I debug this problem to find out the cause?

Well Fedora core 7 is old, but I'm posting from Fedora core 2, so as far as 
I'm concerned, if it is still working, and your happy with it, keep using it.

Back to your sounds. Can you post the output from the following commands, 
which will show if the soundcard is being detected, and if the necessary 
modules are being loaded,

cat /proc/asound/cards
/sbin/lsmod | grep snd

It's worth also opening alsamixer in Gnomes terminal, or KDE's Konsole, if 
you're using KDE like me, and see if all the necessary sliders are still up 
(Master, Front, PCM, CD), and that none of these controls are muted (The M 
key toggles the mute/unmute).

Have you plugged a new audio related device into the USB (webcam, usb midi 
keyboard, etc). The usb starts early in the boot process, and alsa can detect 
these devices as soundcards, and set them as card0, thus stopping your actual 
soundcard using the card0 slot, resulting in no sounds.

Just a few thoughts for a start.



OK, here is the output, but it looks same as I have
always seen it:
# cat /proc/asound/cards
 0 [SI7012         ]: ICH - SiS SI7012
                      SiS SI7012 with ALC655 at irq 18
 1 [Modem          ]: ICH-MODEM - SiS SI7013 Modem
                      SiS SI7013 Modem at irq 18
# /sbin/lsmod | grep snd
snd_intel8x0m          23377  0
snd_seq_dummy          11461  0
snd_intel8x0           39657  4
snd_ac97_codec        116633  2 snd_intel8x0m,snd_intel8x0
ac97_bus               10817  1 snd_ac97_codec
snd_seq_oss            37185  0
snd_seq_midi_event     14913  1 snd_seq_oss
snd_seq                56673  5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event
snd_seq_device         15061  3 snd_seq_dummy,snd_seq_oss,snd_seq
snd_pcm_oss            47553  0
snd_mixer_oss          22721  1 snd_pcm_oss
snd_pcm                80585  5 snd_intel8x0m,snd_intel8x0,snd_ac97_codec,snd_pcm_oss
snd_timer              27721  3 snd_seq,snd_pcm
snd                    59753  16 snd_intel8x0m,snd_intel8x0,snd_ac97_codec,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer
soundcore              14945  1 snd
snd_page_alloc         16337  3 snd_intel8x0m,snd_intel8x0,snd_pcm

The only NEW item I have plugged in over 2 weeks ago has been
a BLUETOOTH stick for my bluetooth mouse. But that did not disable
the sound. The sound went away about 2 days ago. So, That leaves
me puzzling over why I lost the audio.

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