[Bug 71174] [HD4000] Huge performance drop in xf86-video-intel-2.21.14

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71174

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
(To alleviate the symptoms you can update your kernel or disable
double-buffering of composite managers.)

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