Internal microphone does not work with 5.12 (Tiger Lake, X1 Nano)

[Nico Schottelius]

Hey Kai,
Kai Vehmanen <kai.vehmanen at linux.intel.com> writes:

> Hi Nico,
>
> On Thu, 27 May 2021, Nico Schottelius wrote:
>
>> > it seems more kernel config options are missing. Distribution kernels
>> > typically enable all the machine drivers, but you are specifically missing
>> > CONFIG_SND_SOC_INTEL_SKL_HDA_DSP_GENERIC_MACH=m
>>
>> I've enabled this one and all machine types and indeed the card is being
>> recognised (report at
>> http://alsa-project.org/db/?f=5cbe7c293cbb80ab548b892cfc8b991476b0b2aa).
>> I checked permissions on /dev/snd, which looks good.
>>
>> However, obs does not list the microphone at all and
>> chromium / jitsi shows the snd-hda-dsp mic, however does not let me
>> select it.
>
> ok, that's great so the driver appears to work now. You could try
> to do simple arecord test in terminal:
>
> arecord -fdat -vv -Dplugw:0,6 -c4 /dev/null

That does not work:

[15:55] nb3:~% arecord -fdat -vv -Dplugw:0,6 -c4 /dev/null
ALSA lib pcm.c:2660:(snd_pcm_open_noupdate) Unknown PCM plugw:0,6
arecord: main:830: audio open error: No such file or directory

However, recording with audacity produces to results:

- no sound recorded by default
- sound recorded when I plugin an external headset

And using arecord -fdat -vv -c4 /dev/null (without -Dplugw) I get
output, but the level is always 00% without the headset, ranges 02 ~ 90%
with the headset plugged in.

I was wondering if there's a hardware switch "broken"
for the detection of the headset and that's why the mic is muted
internally?


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