https://bugs.freedesktop.org/show_bug.cgi?id=89374

--- Comment #3 from Michel Dänzer <michel@daenzer.net> ---
No need to install any additional packages, just put something like this in
/etc/X11/xorg.conf:

Section "Device"
        Identifier "Device0"
        Driver  "radeon"
        Option  "AccelMethod" "glamor"
EndSection

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