[pulseaudio-discuss] Conexant CX20585 recording does not work

[Dark Shadow]

On Mon, Mar 7, 2011 at 12:56 PM, Gabriel Schulhof <nix at go-nix.ca> wrote:
> Hi!
>
> My mom has a laptop with the following sound card:
>
> lspci: 00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
> (rev 40)
>
> driver: snd_hda_intel
>
> alsamixer:
> Card: HDA ATI SB
> Chip: Conexant CX20585
>
> I can't record from this card no matter what I try. It seems that
> alsamixer has a lot more options than pulseaudio:
>
> Mic B            <Capture switch>
> Mic C            <Capture switch>
> Mic E            <Capture switch>
> Mic F            <Capture switch>
> Capture          <0% -- 100% slider>
> Analog Mic Boost <0 db -- 40 db slider with 10 db increment>
>
> Nevertheless, I will attach the output from pacmd list-sources.
>
> I have tried to record from each mic in turn, I have tried the different
> boost levels (0 db - 40 db), but I have had no luck picking up anything. I
> have attached an external mic to the line-in, but no difference.
>
> When I say "I have tried to record" I mean that I logged into her
> computer, chose one of the mics from the above list, and then I told my
> mom to say something while looking at the input sound level indicator in
> the GNOME sound settings panel. On other computers, I have found this a
> sufficient indication of whether the mic works.
>
> Is this inability to record a known limitation of this sound card? If not,
> is there some special setting I have to modify to make it work?
>
> TIA for your help,
>
>
>
> Gabriel
>
>
>
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>
>

Have you tried loading the module with different model parameters it
can make the difference (for example my laptop by default only shows 2
channel stereo and mics don't work but with the right model I get mics
and all the way up to 5.1ch surround sound)

Run this command to see your options and trial and error them since
some times another is close enough (I have to use one for a different
laptop that happens to have the same sound setup)

zcat /usr/share/doc/alsa-base/driver/HD-Audio-Models.txt.gz