[Bug 60402] [gen4] SNA driver has again some artifacts (cf 55500)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=60402

--- Comment #6 from Chris Wilson <chris at chris-wilson.co.uk> ---
With commit 86e025a1842f3c2f319676818b1f4624cd94ebc5
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Feb 13 22:05:34 2013 +0000

    sna/gen4: Restore nonrectiinear spans workaround

    Instead of relying on the macro, the intention was simply to use the
    prefer_gpu hint. However, I dropped it whilst refactoring ideas from
    later generations. So restore both the debug control to force spans as
    well as the intended workaround.

    Reported-by: Edward Sheldrake <ejsheldrake at gmail.com>
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

are we back to the less regular flickering corruption?

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