I think this bug is related to this one:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/418617

It is more detailed and suggests the source of the problem; it also
seems that the bug occurs in many more machines.

The suggested fix there (for a Dell XPS) is to install linux-backports-
modules-alsa-karmic-generic or linux-backports-modules-alsa-karmic-
generic-pae (depending on your kernel).

However, this did not work for my Lenovo X300, so it's not resolved yet,
but maybe somebody can use the information to construct a solution for
the Lenovo's as well.

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Internal microphone does not work
https://bugs.launchpad.net/bugs/440251
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