[pulseaudio-discuss] Conexant CX20585 recording does not work

Gabriel Schulhof nix at go-nix.ca
Thu Apr 7 05:02:48 PDT 2011


Sorry for the late response!

On Tue, March 8, 2011 05:44, David Henningsson wrote:
> On 2011-03-08 00:26, Colin Guthrie wrote:
>> 'Twas brillig, and Gabriel Schulhof at 07/03/11 19:56 did gyre and gimble:
>>> Hi!
>>> My mom has a laptop with the following sound card:
>>> lspci: 00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel
>>> (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
>>> 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
>>> sufficient indication of whether the mic works.
>>> Is this inability to record a known limitation of this sound card? If
>>> is there some special setting I have to modify to make it work? TIA
for your help,
>> Some mics do this weird out-of-phase thing whereby the recording level
is effectively 0 when the stereo volume is synced. If you set left to
say 5% and right to say 95% then it works fine.
>> This may be the case with your h/w too.
>> FWIW The "extra" options you see in ALSA are generally confusing and
useless. PA attempts to consolidate it and make it a lot more user
>> Normally you'd get a list of several "port" selectors in
>> gnome-volume-control. Sadly as your card uses the incredibly helpful
names of "Mic B" through "Mic F" these do not match the various
"standard" names we probe for.
>> David, have you come across this model on your travels?
> Many times, that's the fallback for many Conexants.
>> Any ideas on how
>> we could best support it?
> This one is one of few that lack an auto-parser of the pin default
config, so for now - model quirks. Without seeing alsa-info or something
similar, I can't tell which model would fit.

Please find it attached.

> In the long run we would benefit from an autoparser handling these as well.

TIA for any advice,

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