Comment 24 for bug 641640

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David Mandala (davidm) wrote : Re: Sony Vaio built in Microphone and mic in does not work

Found that adding a line to /etc/modprobe.d/alsa-base.conf "options snd-hda-intel model=laptop-amic" and rebooting allows the external mic in jack to work, it does not fix the internal mic.

I tried the line: "options snd-hda-intel model=auto", that did not fix the issue.