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?
In case this helps: As i was also testing DRI3/Present + PRIME on the
hybrid graphics MBP, if i use the Intel HD as display gpu and the
NVidia/nouveau as render offload gpu i don't get any corruption/flicker
even with the atomic pageflip code for legacy pageflips. Iow. the path
using dmabuf fence wait in intel_prepare_plane_fb works fine.
thanks,
-mario
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