Created attachment 137714 [details]
GPU crash dump from /sys/class/drm/card0/error

Some pertinent lines from journalctl:

Mar 01 09:49:30 HOSTNAME kernel: [drm] GPU HANG: ecode 9:0:0x85dfbeff, in Xorg [882], reason: Hang on rcs0, action: reset
Mar 01 09:49:30 HOSTNAME kernel: [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
Mar 01 09:49:30 HOSTNAME kernel: [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
Mar 01 09:49:30 HOSTNAME kernel: [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
Mar 01 09:49:30 HOSTNAME kernel: [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
Mar 01 09:49:30 HOSTNAME kernel: [drm] GPU crash dump saved to /sys/class/drm/card0/error
Mar 01 09:49:30 HOSTNAME kernel: i915 0000:00:02.0: Resetting rcs0 after gpu hang
Mar 01 09:49:38 HOSTNAME kernel: i915 0000:00:02.0: Resetting rcs0 after gpu hang
Mar 01 09:49:46 HOSTNAME kernel: i915 0000:00:02.0: Resetting rcs0 after gpu hang
Mar 01 09:49:54 HOSTNAME kernel: i915 0000:00:02.0: Resetting rcs0 after gpu hang
Mar 01 09:50:02 HOSTNAME kernel: i915 0000:00:02.0: Resetting rcs0 after gpu hang
Mar 01 09:50:02 HOSTNAME at-spi-bus-launcher[1594]: XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":0"
Mar 01 09:50:02 HOSTNAME at-spi-bus-launcher[1594]:       after 110868 requests (110868 known processed) with 0 events remaining.
Mar 01 09:50:02 HOSTNAME unknown[1567]: xfce4-notifyd: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.

After this several more programs report failures and crashes, the screen went black and came back with the login screen.  Last entry before these lines was about a half hour earlier.