https://bugs.freedesktop.org/show_bug.cgi?id=69341

--- Comment #38 from darkbasic darkbasic@linuxsystems.it --- I know it well, raster really sucks that much with radeonsi :)

Fortunately you can have fast 2D (at the expense of some corruption): echo "export QT_GRAPHICSSYSTEM=native" >> ~/.kde4/env/qt-graphicssystem.sh