On 07/06/2016 03:05 PM, Chris Wilson wrote:
On Wed, Jul 06, 2016 at 12:17:55PM +0200, Mario Kleiner wrote:
Since i pulled the current drm-next tree i see strong flicker and
visual corruption during pageflipping, both in my own app, but also
in KDE4 and KDE5 Plasma with desktop composition enabled. This
happens on both Intel HD Ironake mobile (Apple MBP 2010) and HD-4000
Ivybridge mobile (Apple macMini 2012).
It looks like page flips are not waiting properly for rendering to
complete, showing partially rendered frames at flip time.
If i revert Daniel's commit that switches legacy pageflips from the
old code path to the atomic code, all problems disappear, so
apparently the atomic code for Intel is not quite ready at least on
those parts?
Exactly right, we've reverted the enabling patch for the time being.
Daniel Stone has spotted the likely problem, but we also want to review
the handling of state/old_state to see if the same problem has cropped
up elsewhere.
-Chris
Ah ok, now i see it in drm-intel-next-queued. I'm probably not adding
anything new here, but wrt. your crc based tests not catching it, while
it happens all the time for me under KDE, in my own fullscreen app, it
only obviously happens for some tests, the more graphics heavy ones not
others, so probably (gfx-)load dependent? Maybe the tests don't put
enough work onto the gpu to still keep it rendering at flip time.
-mario
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