> > > hmm, strange, i don't found any description about this behavior in the
> > > datasheet...
> > 
> > Is there anything I can do to (help) find out what's wrong?
> 
> please check /proc/asound/card0/ac97#0regs whether the value of
> register 0x18 varies.  if it doesn't change, then something wrong.
> if it changes, then the hardware likely doesn't support this PCM
> channel.

When I mute the channel (which works), that register gets ORed with 0x8000.
When I play with the volume, it gets from 0x0000 (full volume) to 0x1f1f
(no volume).

So, this means there's nothing to do?  It's just cheap hardware?




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