[Bug 67823] xf86-video-intel 2.21.14-1 slows down gnome-shell with SNA accelleration

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67823

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
The obvious candidate is 

commit 3f04b6f33f05f8a24698f934a23462269b84917d
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Aug 1 14:49:36 2013 +0100

    sna/dri: Disable TripleBuffering by default for compositors

which is more or less at the request of the gnome-shell authors.

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