[Bug 94021] Skylake GPU hang ecode 9:0:0x86dffffd

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94021

--- Comment #16 from Zhang Chi <zhangchi866 at gmail.com> ---
Similar situation here:

[ 5087.853310] [drm] GPU HANG: ecode 9:0:0x86dffffd, in Xorg [862], reason:
Hang on rcs0, action: reset
[ 5087.853316] i915 0000:00:02.0: Resetting rcs0 after gpu hang
[ 5095.844690] i915 0000:00:02.0: Resetting rcs0 after gpu hang
[ 5107.844711] i915 0000:00:02.0: Resetting rcs0 after gpu hang
[ 5117.832724] i915 0000:00:02.0: Resetting rcs0 after gpu hang
[ 5125.828738] i915 0000:00:02.0: Resetting rcs0 after gpu hang

Then X restarts (without log).

CPU: i3 6320

$ lspci
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06)

Very reproduceable when editing texts in LibreOffice Impress 6.0.1.1 (other
similar versions should also trigger). Other applications do not seem to
trigger the problem.

I believe the problem started a few months ago and happens with kernel 4.9. But
I cannot remember clearly.

Adding "i915.enable_rc6=0" alone to boot parameters does NOT fix the problem.
Adding "intel_iommu=igfx_off" does seem to fix it.

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