[alsa-devel] SigmaTel STAC9221 - Mux Amp-Out > 0x02 == microphone not working

[Takashi Iwai]

At Sun, 27 May 2007 23:50:35 +0100,
Ivan N. Zlatev wrote:
> 
> Hello,
> 
> I am on an iMac ("*imac-20" model/pinconfig) with a Intel HD card with
> the SigmaTel STAC9221 codec. I have attached the inital codec info
> after modprobe. I am using Alsa HG. Setting the mux gain to a value >
> 20 (0x02 Amp-Out value) results a non-working microphone. Steps and
> codec diffs as follows:

Thanks for the survey!

And, does this volume have any influence on the quality of recorded
sound at all?  If not, we should remove this control rather than
keeping a dangerous thing...


Takashi


> 1) initial - microphone working
> 2) Mux Gain = 10 - microphone working
> 
>  Node 0x12 [Audio Selector] wcaps 0x30010d: Stereo Amp-Out
>    Amp-Out caps: ofs=0x00, nsteps=0x04, stepsize=0x27, mute=0
> -  Amp-Out vals:  [0x00 0x00]
> +  Amp-Out vals:  [0x01 0x01]
>    Connection: 7
>       0x0e 0x15 0x0f 0x0b* 0x0c 0x0d 0x0a
> 
> 3) Mux Gain = 20 - microphone working
> 
>  Node 0x12 [Audio Selector] wcaps 0x30010d: Stereo Amp-Out
>    Amp-Out caps: ofs=0x00, nsteps=0x04, stepsize=0x27, mute=0
> -  Amp-Out vals:  [0x01 0x01]
> +  Amp-Out vals:  [0x02 0x02]
>    Connection: 7
>       0x0e 0x15 0x0f 0x0b* 0x0c 0x0d 0x0a
> 
> 
> 4) Mux Gain = 30 - microphone not working
> 
>  Node 0x12 [Audio Selector] wcaps 0x30010d: Stereo Amp-Out
>    Amp-Out caps: ofs=0x00, nsteps=0x04, stepsize=0x27, mute=0
> -  Amp-Out vals:  [0x02 0x02]
> +  Amp-Out vals:  [0x03 0x03]
>    Connection: 7
>       0x0e 0x15 0x0f 0x0b* 0x0c 0x0d 0x0a
> 
> 
> 4) Mux Gain = 40 - microphone not working
> 
>  Node 0x12 [Audio Selector] wcaps 0x30010d: Stereo Amp-Out
>    Amp-Out caps: ofs=0x00, nsteps=0x04, stepsize=0x27, mute=0
> -  Amp-Out vals:  [0x03 0x03]
> +  Amp-Out vals:  [0x04 0x04]
>    Connection: 7
>       0x0e 0x15 0x0f 0x0b* 0x0c 0x0d 0x0a
> 
> Regards
> -- 
> Ivan N. Zlatev
> 
> Web: http://www.i-nZ.net
> "It's all some kind of whacked out conspiracy."