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[Constantin Zankl <constantin.zankl@xxxxxxxxx>]

I figured out that is has nothing to do with the AC.

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https://bugs.launchpad.net/bugs/1451165

Title:
  GPU HANG after suspend/resume

Status in xserver-xorg-video-intel package in Ubuntu:
  New

Bug description:
  Platform: Lenovo T450s
  Desktop Environment: Cinnamon
  Driver Version: 2.99.910-0ubuntu1.6

  The GPU Hangs after a suspend/resume when the AC is not connected. But
  this behavior is not allays the case, but in most of the cases.

  [  102.885927] [drm] stuck on render ring
  [  102.886800] [drm] GPU HANG: ecode 0:0x5fd68105, in Xorg [1553], reason: Ring hung, action: reset
  [  102.886802] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
  [  102.886802] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
  [  102.886803] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
  [  102.886803] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
  [  102.886804] [drm] GPU crash dump saved to /sys/class/drm/card0/error

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