You're right, an error occurred the previous night, when the computer was unattended, and I didn't notice (dmesg output below). I rebooted anyway so the error state is now lost.
Are you suggesting that I could have reset the i915_error_state and catting it would then have printed the subsequent error state? Or do I have to reset it after every error? [2650426.931357] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state [2650426.932473] i915: render error detected, EIR: 0x00000010 [2650426.932473] i915: IPEIR: 0x00000000 [2650426.932473] i915: IPEHR: 0x02000000 [2650426.932473] i915: INSTDONE_0: 0x8089816f [2650426.932473] i915: INSTDONE_1: 0x8915d10e [2650426.932473] i915: INSTDONE_2: 0x00000000 [2650426.932473] i915: INSTDONE_3: 0x00000000 [2650426.932473] i915: INSTPS: 0x8001e035 [2650426.932473] i915: ACTHD: 0x45e04684 [2650426.932473] i915: page table error [2650426.932473] i915: PGTBL_ER: 0x00000001 [2650426.932473] [drm:i915_report_and_clear_eir] *ERROR* EIR stuck: 0x00000010, masking -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1211123 Title: Xorg i915 hangcheck hung GPU after workspace switch To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1211123/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
