Created attachment 143516 [details]
dumps from dmesg, glxinfo and xorg

Using Kernel 4.20.13 (on Ubuntu 18.04.2) the game Shadow of Mordor installed
from steam will freeze the screen after 5-120 minutes. SSH'ing into the machine
still works.

I'm attaching glxinfo, Xorg.log, and dmesg log from the crash for reference.

Btw. I've added "drm.debug=0x1e log_buf_len=1M" to grub but wasn't able so far
to catch anything writting to /sys/class/drm/card0/error


Let me know if there is anything I can do to help debugging.