[Bug 98036] [BYT] constant screen flicker and rendering errors [regression]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98036

--- Comment #9 from Pekka Jylhä-Ollila <pekka.jylha-ollila at intel.com> ---
The flickering starts as soon as the desktop launches, and almost every screen
update causes the screen to go black. After a short while the screen remains
black and doesn't show anything.

I tried reverting the previously mentioned commit 2efb813 from the latest
drm-intel-nightly and it fixed the flickering issue on BYT.

The flags passed to i915_gem_object_ggtt_pin in
i915_gem_object_pin_to_display_plane changed from PIN_MAPPABLE to
(PIN_MAPPABLE | PIN_NONBLOCK), which seems to have caused the problem.
Changing the flags back to PIN_MAPPABLE also fixed the flickering.

Chris, can you revert this change or fix the issue on BYT?

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