from the information you've already attach, seems to be related to bug #134146, 
could you please check.
there's also a workaround suggested there.

** Changed in: linux-source-2.6.22 (Ubuntu)
Sourcepackagename: None => linux-source-2.6.22

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[gutsy]  sound broken on t60p
https://bugs.launchpad.net/bugs/138897
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