An alternative thing to investigate: There is another bug particular to Sandybridge, with roughly similar symptoms to this one, which has already been git bisected and found a candidate patch. The flagged patch with the fix appears to also affect Arrandale, so I have a hunch it *might* also solve this bug. But that's just a wild guess. Please install and boot this kernel to see if the issue can be reproduced; if not, then this bug may be a dupe of bug #761065:
An alternative thing to investigate: There is another bug particular to Sandybridge, with roughly similar symptoms to this one, which has already been git bisected and found a candidate patch. The flagged patch with the fix appears to also affect Arrandale, so I have a hunch it *might* also solve this bug. But that's just a wild guess. Please install and boot this kernel to see if the issue can be reproduced; if not, then this bug may be a dupe of bug #761065:
http:// people. canonical. com/~acelan/ bugs/lp753189/