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[See Furst <555573@xxxxxxxxxxxxxxxxxx>]

So I tried JH's solution and it didn't work. Just to make sure I'm not
skipping a step here's what I did:

1) after initial GPU hang, I logged in via ssh, edited /etc/apt/sources.list
2) added the gpg key
3) sudo apt-get update
4 sudo apt-get upgrade -u
5) restart
6) a few minutes after login, much less time than before, GPU hung again.. This time however I get a different error:

[45381.436034] render error detected, EIR: 0x00000000
[45381.436868] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 28917 at 28544)
[45383.488015] [drm:i915_gem_idle] *ERROR* hardware wedged
[45384.613638] [drm:i915_gem_entervt_ioctl] *ERROR* Reenabling wedged hardware, good luck
[45384.972012] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung

So it looks like it's not the back cache this time.. I think it's
because those drivers are nvidia and mine is not?

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https://bugs.launchpad.net/bugs/555573

Title:
  [g41] GPU hung:  Failed to submit batchbuffer: Input/output error