This is a known issue with Lenovo Thinkpads. The workaround is to use a
shell script and a recompiled kernel module. You can find the steps
here:
http://askubuntu.com/questions/125367/enabling-mic-mute-button-and-
light-on-lenovo-thinkpads
It would be nice if this could work out of the box,
*** This bug is a duplicate of bug 788540 ***
https://bugs.launchpad.net/bugs/788540
** This bug has been marked a duplicate of bug 788540
[Thinkpad T410s] Mute indicator gets out of sync
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