Hi Knut, To debug gpu hangs we need you to capture the error_state (after the hang has happened) from the debugfs. See http://intellinuxgraphics.org/i915_error_state.html for details. And also attach the full kernel dmesg, please. Yours, Daniel -- Daniel Vetter daniel.vetter at ffwll.ch - +41 (0) 79 364 57 48 - http://blog.ffwll.ch