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@xxxxxxxxxxxxxxxxxx>
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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