Created attachment 126199 [details] /sys/class/drm/card1/error The content of /sys/class/drm/card1/error is attached. # uname -a Linux hell 4.4.0-36-generic #55-Ubuntu SMP Thu Aug 11 18:01:55 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux My machine is thinkpad t420
*** This bug has been marked as a duplicate of bug 95464 ***
Both Sandybridge and hung on same render ring batch sequence.
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