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SubjectBUG: 4.10 i915 drm display noise regression - bisected to a6a7cc4b7
Hello all,

I'm experiencing display noise in the form of 8x1 pixel bars spuriously
appearing in random locations. This doesn't happen on 4.9, the machine
is an X61s, a Core2Duo 1.8Ghz w/XGA via LVDS.

I was able to bisect the issue to a6a7cc4b7:

commit a6a7cc4b7db6deaeca11cdd38844ea147a354c7a
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri Nov 18 21:17:46 2016 +0000

drm/i915: Always flush the dirty CPU cache when pinning the scanout

Currently we only clflush the scanout if it is in the CPU domain. Also
flush if we have a pending CPU clflush. We also want to treat the
dirtyfb path similar, and flush any pending writes there as well.

v2: Only send the fb flush message if flushing the dirt on flip
v3: Make flush-for-flip and dirtyfb look more alike since they serve
similar roles as end-of-frame marker.

Reproduction is simple, just run this native drm eye candy program:
https://github.com/vcaputo/rototiller

Thanks,
Vito Caputo

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