Ok, so looking at your alsa-info, there are no traces of external mic
functionality, so we need to figure out how it could be working in earlier
releases.
There are two ways to do this:
1) You boot up an installation of Ubuntu 11.10, plug the headset in,
ensure the mic is working, and with the headset still plugged in, run
the alsa-info script and attach the result here, or
2) Install the hda-jack-retask and snd-hda-tools packages from
ppa:diwic/hda , run "sudo hda-jack-sense-test -a" with the headset
plugged in and see if any pin other than the headphone pin is detected
as "present=yes". If so, you can use the hda-jack-retask program to set
that pin as microphone input.
** Changed in: alsa-driver (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/950494
Title:
[Macbook Air 3,2] headset mic not recognized
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