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

--- Comment #5 from darkbasic darkbasic@linuxsystems.it --- Card is AMD Radeon HD 7950. The graphical glitches with the X11/XRender backend seems to be a known issue (https://bugs.freedesktop.org/show_bug.cgi?id=64297) so I modified the bug to track just the issues with the Raster backend.

Actually the KDE overall desktop experience is so bad that I had to switch back to the integrated Ivy Bridge graphic :(