[Bug 88540] [All - Bisected] slow cursor movements with atomic plane helpers

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88540

--- Comment #2 from Matt Roper <matthew.d.roper at intel.com> ---
I believe this patch:
  http://lists.freedesktop.org/archives/dri-devel/2015-January/075670.html

will solve the immediate problem being reported here, at least for the existing
Intel userspace I'm aware of.

The problem here is that the display server wants to update the cursor faster
than the display refresh rate and we were throttling the updates to vblank. 
The patch here removes that throttling for the case where the cursor is only
being moved to a new position, but doesn't address the case where the cursor
image changes.  If there are any userspace display servers that also try to
update the cursor image to a new framebuffer while reprogramming the cursor
faster than the refresh rate, they'll still see the throttling.  I'm not sure
if there are any existing userspace display servers that work that way today.

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