(In reply to Takashi Iwai from comment #5) > What if you avoid radeon X11 driver? Does it render better? No observable difference after removing it # zypper se -si video | grep xf86 i+ | xf86-video-fbdev | package | 0.5.0-1.10 | i586 | OSS i | xf86-video-mga | package | 2.0.0-2.4 | i586 | OSS i+ | xf86-video-vesa | package | 2.5.0-1.1 | i586 | OSS and only then starting Xorg.