https://bugzilla.kernel.org/show_bug.cgi?id=38382
--- Comment #3 from Michel Dänzer michel@daenzer.net 2011-06-28 09:18:31 --- (In reply to comment #0)
Unfortunately I can't tell exactly when this behavior started to happen, but somewhere between 2.6.39 and 2.6.39.1.
Can you bisect?