[Bug 89360] [bdw-u iommu] DMAR error -> GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89360

--- Comment #39 from Julian Cromarty <julian.cromarty at gmail.com> ---
I built and tried 4.7.2 last night and enabling VT-d still causes the freezes
to happen so I don't think it is fixed yet. Kernel log messages when the
freezes happen contain the following when it was able to recover from the
freeze:

[ 1936.694513] [drm] stuck on render ring
[ 1936.694899] [drm] GPU HANG: ecode 8:0:0x85dffffb, in X [3356], reason:
Engine(s) hung, action: reset
[ 1936.696494] drm/i915: Resetting chip after gpu hang

And the last one that killed it, requiring the power button to be held to turn
the machine off, had a different ecode:

[ 1944.706379] [drm] stuck on render ring
[ 1944.706694] [drm] GPU HANG: ecode 8:0:0xbf9fffff, reason: Engine(s) hung,
action: reset
[ 1944.708378] drm/i915: Resetting chip after gpu hang

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