Can you confirm this:

Add the following line to /etc/modprobe.d/alsa-base.conf
options snd-hda-intel model=thinkpad

...and reboot. After that, can you successfully record from both int and
ext mic? It might be that you need to open alsamixer and adjust the
"analog mic boost" control.

** Changed in: alsa-driver (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/725265

Title:
  Internal/external microphone is non-functional

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