Hmm, could you try the following:
1) Uninstall the dkms package so you have a clean precise kernel.
2) Add this row to /etc/modprobe.d/alsa-base.conf
options snd-hda-intel model=auto
3) reboot
Is this making internal mic work (without causing other
changes/regressions for other outputs/inputs)?
** Changed in: alsa-driver (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1004819
Title:
[Lenovo SL410, Intel 82801I, Mic, Internal] Mic doesn't work
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