[Bug 85123] [BDW/SKL] FBC is not actually working after start gnome-sesstion desktop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85123

--- Comment #6 from Chris Wilson <chris at chris-wilson.co.uk> ---
gnome-shell will only render when there is damage (or it feels to the need to
update its own display). It will stop rendering after a while, the only
question is whether it quiesces enough for FBC to kick in. Note that without
GLX_EXT_buffer_age (i.e. unpatched DRI2), gnome-shell uses DRI2CopyRegion to do
its updates, and if you don't have TearFree enabled, that will just dirty small
chunks of the framebuffer.

Question to the audience: is it worth extending the pageflip ioctl to pass down
the dirty rectangles?

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