https://bugs.freedesktop.org/show_bug.cgi?id=60879
--- Comment #161 from madmalkav myhateisblind@hotmail.com --- Ben, I'm afraid the initialization of the conflicting parts of the card is just delayed in your current install, that's why it fails later. Hope I'm wrong.
If you want support for your tests, #radeon @ irc.freenode.net is always full of people that will give you a hand with that.