On Wed, Jun 06, 2018 at 10:26:15AM +0200, Christian König wrote: > Well what did you do to trigger the lockup? Looks like an application send > something to the hardware to crash the GFX block. So what I observed was (in that order): machine was building a kernel so was busy, X didn't respond for a couple of seconds (which it should not do) and I switched to tty8 to see what dmesg says (I am routing dmesg to tty8). At that moment it showed the lockup splat and then X restarted showing me the login prompt again. I'm guessing the X restart was caused by the GPU reset. So if I had to guess, maybe pressing Ctrl+Alt+F8 caused the modeset change and thus reset? Hmm, this is just me guessing with my non-knowledge about graphics. :) Thx. -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.