Hi Takashi, I've done some more Kernel version testing on this bug and I can reproduce exactly the same results as this bug report: https://bugs.freedesktop.org/show_bug.cgi?id=86115 So the last known good kernel is 3.12.37 and the first known bad Kernel is 3.13.7 I think it's safe to assume that https://bugzilla.suse.com/show_bug.cgi?id=904483 is a duplicate of this bug. Thanks