https://bugs.freedesktop.org/show_bug.cgi?id=66964
--- Comment #1 from Alex Deucher agd5f@yahoo.com --- Are things improved any with Dave's drm-fixes tree: http://cgit.freedesktop.org/~airlied/linux/log/?h=drm-fixes It contains some alignment fixes for VM that may help and it should provide better debugging output of the VM faults.