try 'echo 0 > /sys/module/i915/parameters/semaphores' to see if it stops
the hangs.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Triaged => Confirmed
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https://bugs.launchpad.net/bugs/1041790
Title:
[sandybridge-m-gt2] GPU lockup IPEHR: 0x0b160001 IPEHR: 0x0b140001
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