You should also check your dmesg and /sys/kernel/debug/dri/0/i915_error_state when you ssh into it when it's down, in the case that the issue is a gpu lockup.
** Changed in: xserver-xorg-video-intel (Ubuntu) Status: New => Confirmed ** Changed in: xserver-xorg-video-intel (Ubuntu) Importance: Undecided => Medium ** Changed in: xserver-xorg-video-intel (Ubuntu) Importance: Medium => High ** Changed in: xserver-xorg-video-intel (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/767436 Title: compiz crashed with SIGSEGV in brw_validate_state() -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs