[Bug 55500] [sna gen4] corrupt rendering (and flickering on redraw)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55500

--- Comment #90 from Chris Wilson <chris at chris-wilson.co.uk> ---
I have pushed a revised workaround to the best of my understanding to

commit 368c909b29758f996dbbdbec4d471df23f60bc04
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sat Jul 6 22:27:44 2013 +0100

    sna/gen4: Restore the flush-every-vertex w/a

    This is an abhorrent workaround for some internal GPU brokenness. A
    slight refinement since earlier times is the recognition that 16 is a
    magic number limiting the maximum number of inflight rectangles through
    the GPU.

    References: https://bugs.freedesktop.org/show_bug.cgi?id=55500
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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