Re: [gentoo-user] Problem with sound card

["Albert W. Hopkins" <marduk@letterboxes.org>]

On Mon, 2011-10-24 at 20:35 +0800, Lavender wrote:
> I have asked the question in gentoo forum , but
> it seems that very few people like hanging around
> in forums , I didn't get useful method.
> My sound card can't work normally , when I use music
> player there is no sound .
> Someone said that I need low-level codec support , I'm not
> sure whether it is. Here is the information in sysfs, I really
> hope you can know where the problem is.
>  
> # ls /sys/class/sound
> audio  card0 card1  controlC0  controlC1
> dsp  hwC0D0  hwC1D0 mixer  mixer1
> pcmC0D0c  pcmC0D0p  pcmC1D3p
> seq  sequencer  sequencer2  timer
>  
> # ls -l /sys/class/sound/card0
> lrwxrwxrwx 1 root root 0 Oct 25 03:37 card0
> -> ../../devices/pci0000:00/0000:00:14.2/sound/card0
>  
> # ls /sys/class/sound/card0/
> audio  controlC0  device  dsp
> hwC0D0  id  mixer  number
> pcmC0D0c  pcmC0D0p  power
> subsystem  uevent
> ----Regards----
> ----Lavender----
> 
> 
When you go in into the kernel config, there is the option for Intel
AC97-like sound, which I believe is what the majority of sound cards
use.  For AC97 there are "codecs" in the kernel config.  A safe choice
is to select them all.

The output you gave is not very helpful or informative, but I'll ask
just a few questions/suggestions:

      * Looks like maybe you have 2 sound cards. Are you going through
        the correct card for output?
      * Did you go into alsamixer to verify that the appropriate outputs
        are unmuted?
      * Try "aplay" or "speaker-test" or something else low-level to see
        if even basic output is working.  It could be your sound card is
        fine but you don't have the correct support for whatever music
        player you are using.