I can't speak for the OP, but I was hit by this bug with an almost identical CPU setup (Xeon x5355) and the kernel in proposed doesn't resolve the issue for me. The upstream utopic kernel link posted at #7 however does fix it. My symptoms are identical.
I can't speak for the OP, but I was hit by this bug with an almost identical CPU setup (Xeon x5355) and the kernel in proposed doesn't resolve the issue for me. The upstream utopic kernel link posted at #7 however does fix it. My symptoms are identical.