[Bug 100076] [BDW] intel_iommu=on GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100076

--- Comment #1 from yunying sun <yunying.sun at intel.com> ---
When testing tboot on an Intel NUC5i5MYHE, graphics display nothing but a black
screen after system boot up. There's also GPU hang found in kernel log:
[   68.752002] [drm] GPU HANG: ecode 8:0:0x85dffffb, in X [1616], reason: Hang
on render ring, action: reset
[   68.752005] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[   68.752007] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[   68.752008] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[   68.752008] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[   68.752009] [drm] GPU crash dump saved to /sys/class/drm/card0/error

Such GPU hang is seen with RHEL 7.4 SP1/SLES12 SP3 Beta3/Ubuntu 17.04.
Attached RHEL 7.4 kernel log and error log from /sys/class/drm/card0/error.

After adding "intel_iommu=on,igfx_off" to boot cmdline, no GPU hang found and
display shows desktop normally after system boot up.

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