There has been some interesting findings upstream for the CX20549 chip,
where it does not have individual amps for input but only one for all
inputs. http://mailman.alsa-project.org/pipermail/alsa-
devel/2011-October/045152.html
** Changed in: alsa-driver (Ubuntu)
Status: Incomplete => Triaged
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https://bugs.launchpad.net/bugs/849967
Title:
[Lenovo Y300] Microphone is unable to record any audio
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