This bug is awaiting verification that the kernel for Quantal in -proposed solves the problem (3.5.0-22.33). Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-quantal' to 'verification-done-quantal'.
If verification is not done by one week from today, this fix will be dropped from the source code, and this bug will be closed.
See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!