[Bug 69528] intel driver shows blank screen when set to UXA only after cold start

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69528

--- Comment #12 from Chris Wilson <chris at chris-wilson.co.uk> ---
This should fix the corruption in the panel:

commit e916c922ce3913712cd8a9b76ab037840b7f07f1
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Jan 23 17:30:29 2014 +0000

    sna: Avoid erroneous discarding operations for partial composites

    Composite operations were presumed to cover their entire width x height
    area. However, a few paths submit boxes that do not cover the clip
    region and so the optimisation made during prepare to discard completely
    overwritten data is incorrect (and leads to corruption - stale data is
    seen which the client expected to have been overdrawn). So along these
    more unusual paths, we must add a flag to prevent the overzealous
    discard. Notably, xfce4 triggers this as it uses a lot of unantialiased
    trapezoids in its theme drawing.

    References: https://bugs.freedesktop.org/show_bug.cgi?id=69528
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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