Comment 185 for bug 745608

(In reply to comment #84)
> Basically inspect 'sudo perf top' for pixman functions.

Alright.

> There is a slim chance you trigger bug 59711 (as in I have no idea what that
> is about...) and end up with something in the Xorg.log.

Unfortunately with two patches applied, using `xrandr` to enable the external screen seems to lock up the system. I have to find more time to look into this.