Hello Xen,
I have your same problem. I'm using as a workaround the following commands:
killall -9 pulseaudio
sudo alsa force-reload
with these commands, my external and internal microphones start working again 
(well, they usually die again after 10 minutes.. but it's still something).
Hope to find soon a better solution.

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No record-signal from internal mic (Notebook, Sigmatel, HDA Intel)
https://bugs.launchpad.net/bugs/480815
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