Comment 116 for bug 946899

Dual head display seemed to work fine earlier this month when I installed this system. In the last week or so I run into the same issues anytime the second display is connected.
[ 356.614203] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
[ 356.614208] [drm] capturing error event; look for more information in /sys/kernel/debug/dri/0/i915_error_state
[ 356.621884] [drm:kick_ring] *ERROR* Kicking stuck wait on blitter ring
[ 452.710408] Watchdog[966]: segfault at 0 ip 00007ff58f002938 sp 00007ff57ca5f010 error 6 in chromium[7ff58e229000+503a000]
[ 458.656344] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
[ 458.656380] [drm:kick_ring] *ERROR* Kicking stuck wait on blitter ring
[ 470.681128] Watchdog[1146]: segfault at 0 ip 00007fc67a291938 sp 00007fc667cee010 error 6 in chromium[7fc6794b8000+503a000]
[ 473.721812] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
[ 483.709854] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
[ 483.709868] [drm:kick_ring] *ERROR* Kicking stuck wait on blitter ring
[ 541.776618] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
[ 541.776654] [drm:kick_ring] *ERROR* Kicking stuck wait on blitter ring
[ 553.800507] Watchdog[1201]: segfault at 0 ip 00007f83ca2c6938 sp 00007f83b7d23010 error 6 in chromium[7f83c94ed000+503a000]
[ 556.808672] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
[ 556.808693] [drm:kick_ring] *ERROR* Kicking stuck wait on blitter ring