For anyone still having this issue in Quantal (or when using a 3.5.x kernel on an earlier Ubuntu release), according to https://bugzilla.kernel.org/show_bug.cgi?id=25732 a further fix was introduced in kernel 3.7.
For anyone still having this issue in Quantal (or when using a 3.5.x kernel on an earlier Ubuntu release), according to https:/ /bugzilla. kernel. org/show_ bug.cgi? id=25732 a further fix was introduced in kernel 3.7.