Comment # 14 on bug 1181097 from Miklos Vajna

(In reply to Takashi Iwai from comment #8)
> Could you try recording manually via arecord?  e.g.
>    % pasuspender -- aplay -Dplughw:0 -vv foo.wav
> 
> This should record from the headset mic.

At the end I didn't do this test...

(In reply to Takashi Iwai from comment #13)
> Please test the kernel above.  If any other issue regarding the input
> remains, let me know.

... because kernel-default-5.3.18-lp152.4.1.gf1d966f.x86_64 fixes the problem.
:-) Thanks a lot, you can close this bug, I think.