Created attachment 116117 [details]
gzip'ed copy of /sys/class/drm/card0/error

Seems that Bug #89953 occurred again...

System hang for a sec, GPU reset, screen is all garbled now.

  [drm] stuck on render ring
  [drm] GPU HANG: ecode 3:0:0x765fffc1, in systemd-logind [685], reason: Ring hung, action: reset
  [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
  [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
  [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
  [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
  [drm] GPU crash dump saved to /sys/class/drm/card0/error
  drm/i915: Resetting chip after gpu hang

HW is an ACER Aspire One

00:02.0 0300: 8086:27ae (rev 03) (prog-if 00 [VGA controller])
	Subsystem: 1025:015b
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 16
	Region 0: Memory at 58480000 (32-bit, non-prefetchable) [size=512K]
	Region 1: I/O ports at 60c0 [size=8]
	Region 2: Memory at 40000000 (32-bit, prefetchable) [size=256M]
	Region 3: Memory at 58500000 (32-bit, non-prefetchable) [size=256K]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: <access denied>
	Kernel driver in use: i915
	Kernel modules: i915

Kernel is 4.0.4 on Fedora 22.

DDX is xorg-x11-drv-intel-2.99.917-9.20150520 (ie git snapshot from May 20th, 2015)