I'm guessing it's an inverted mic, since other Lenovo machines using
that codec have that problem. For what to do next, see:
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1002978

** Package changed: linux (Ubuntu) => alsa-driver (Ubuntu)

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

** Summary changed:

- No microphone input
+ [Lenovo Thinkpad X220, Conexant CX20590] No microphone input

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https://bugs.launchpad.net/bugs/1072146

Title:
  [Lenovo Thinkpad X220, Conexant CX20590] No microphone input

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