https://bugs.freedesktop.org/show_bug.cgi?id=83792
--- Comment #9 from Tim Nelson wayland@wayland.id.au --- OK, I've narrowed it down quite a bit.
The kernel which Fedora (18) calls kernel-debug-3.6.10-4.fc18.x86_64 works. Xorg segfaults, but the radeon module successfully loads. The kernel which Fedora (19) calls kernel-debug-3.9.5-301.fc19.x86_64 crashes the machine.
Anyway, I will do some more narrowing down, and I'll try ssh access as well.