https://bugs.freedesktop.org/show_bug.cgi?id=30406
--- Comment #14 from Marek Olšák maraeo@gmail.com 2010-09-28 14:47:06 PDT --- I was told that if you do a clean boot, r300g with st/xorg doesn't work. There is a theory that r300g does not initialize some hardware registers at startup. But once you let xf86-video-ati initialize them, you can switch to st/xorg and everything should work.