Bug#696321: Launchpad bug for the same issue
I stumbled upon this bug while using a backported kernel on squeeze,
and in the process of trying to find a solution, I noticed that there
is also a bug report against Ubuntu kernels in launchpad. The patch
attached to a comment there that reverts a certain commit seems to
solve the problem for me. But since I don't know anything about the
kernel's audio subsystem, I'm not really sure this "solves" the
problem.
The Launchpad bug is:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1097396
Christian
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