I carefully read the article. First I tried to look up the output of cat 
/proc/asound/card0/codec#* | grep Codec
(Conexant CX20561 (Hermosa) in 
/usr/share/doc/alsa-base/driver/ALSA-Configuration.txt but but there is no 
information about Hermosa codec or  CX20561 in this file.

I set

options snd-hda-intel power_save=0 power_save_controller=N
options snd-hda-intel model=auto

powersave from 10 to 0 and added snd-hda-intel model=auto, but that
didn't help. For some strange reason, alsamixer and the KDE mixer do not
display all "sliders", while Card0.Codecs.codec.0.txt seems to contain
them. (Though they are not in Card0.Amixer.values.txt)

-- 
Sound capture internal mic not working
https://bugs.launchpad.net/bugs/489878
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