[Bug 70764] [snb] TearFree now triggers stuck semaphores (due to Eliminate the synchronous wait from inside TearFree)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70764

--- Comment #10 from Chris Wilson <chris at chris-wilson.co.uk> ---
Not intentionally targetting this bug, but since this should affect timing
subtly might as well see if it has any impact here:

commit 247ebf86a32b518536a11c2f866b2c885bd55d38
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Oct 22 07:58:03 2013 +0100

    sna: Only force the TearFree exchange before a write

    We can read from the current scanout buffer without incurring a visual
    tear, so delay the GPU bo exchange until we see a write to the object.

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