Apparantly, I was wrong: the bug seems to be not related to PulseAuidio in my case. I was able to reactivate the mic by adding option 'position_fix=1' to the alsa-base.conf (see my report).
Apparantly, I was wrong: the bug seems to be not related to PulseAuidio in my case. I was able to reactivate the mic by adding option 'position_fix=1' to the alsa-base.conf (see my report).