Can you try:
sudo alsa force-unload && sudo modprobe snd-hda-intel enable_msi=1
** Package changed: alsa-driver (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Daniel T Chen (crimsun)
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external microphone seems not to work
https://bugs.launchpad.net/bugs/445615
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