Re: Mixer problem with VT8233/A/8235/8237 AC97 Audio Controller (rev 60)

[Takashi Iwai <tiwai@suse.de>]

At Mon, 24 Jan 2005 21:10:05 -0300,
Horacio de Oro wrote:
> 
> Takashi Iwai wrote:
> > At Sat, 22 Jan 2005 00:54:40 -0300,
> > Horacio de Oro wrote:
> > 
> >>I've a problem with the mixer of my sound card. It never has worked fine.
> >>
> >>I run 'aumix', the /dev/mixer is opened fine:
> >>
> >>horacio@corralito-ng:~$ lsof  /dev/mixer
> >>COMMAND    PID    USER   FD   TYPE DEVICE SIZE NODE NAME
> >>mixer_app  859 horacio   34u   CHR   14,0      5239 /dev/mixer0
> >>aumix     1869 horacio    3u   CHR   14,0      5239 /dev/mixer0
> >>
> >>I can change any volume control (for example: "CD"). While I move the 
> >>control, I can hear the volume goes UP and DOWN, but I can't change the 
> >>"main" volume, and I can't change the "PCM" volume (this control are on 
> >>"top").
> > 
> > 
> > They are not supporbed by your hardware.
> > CMI9739 AC97 codec doesn't have Master and PCM volumes.
> > Only PCM switch works.
> > 
> > 
> > Takashi
> > 
> 
> Hi Takashi! Thanks for your response!
> 
> Using "Gnome Volume Control" v2.8.0 (or earlier), the "PCM" works like a 
> "binary variable", so:
>    1) if the PCM volume is between 1% to 100%, then the volume you hear 
> is at maximum (the same volume is at 1% and to 100%).
>    2) if you put PCM volume at 0%, the PCM volume go off, and you can't 
> hear more mp3, wav, etc.
> 
> So:
>   PCM = 0% -> PCM volume off
>   PCM = 1% to 100% -> PCM volume at maximum
> 
> This way, the only way to put the volume a little down, is using the 
> speakers.

I guess you're using kernel OSS emulation.
The volume attenuation is done in software via alsa-lib's softvol
plugin.  So, it can't work with the kernel OSS emulation.
Use either ALSA native or aoss wrapper.


Takashi


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