Created attachment 131340 [details] dmesg dump (complete) I experience random (relatively low occurrence ~ twice a week) graphic lockups. Video is not updated, mouse is moving but no interaction is possible either with mouse or keyboard. System is somewhat alive and I can login via ssh. I attach a complete dmesg dump taken via ssh. Attempting to kill xorg to restart it resulted in a complete lockup (ssh timed out) and I had to brutally power-cycle the machine. System is an up-to-date debian testing (stretch). At the time of freeze I had one VirtualBox client (Win7) open but inactive (window minimized). I will be available to give further info, if required.
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