[Bug 68410] [bisected ivb] Small black box corruption in firefox

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68410

--- Comment #56 from Chris Wilson <chris at chris-wilson.co.uk> ---
Hmm, just hit an oddity on gen6 that seems relevant to this bug:

commit 82e6d41c2f4f343bd1854d3d8ee4b624b5d68971
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Oct 31 13:35:59 2013 +0000

    sna/gen6: Tweak flush around CC state changes

    In order to fix some font corruption, it appears that we need an extra
    flush in the Sandybridge pipeline when we change the CC stage and the
    render cache is dirty. We previously triggered a full pipeline stall
    for this case.

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