Messages in this thread | | | Date | Mon, 9 Jan 2017 00:32:40 -0600 | From | lkml@pengaru ... | Subject | BUG: 4.10 i915 drm display noise regression - bisected to a6a7cc4b7 |
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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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