The DRI code is still unstable and causes Xorg to crash sometimes at bootup sometimes a short while after working. Even worse through a livelock of the input queue the whole system becomes irresponsive and needs to be rebooted (Bug 32393).
Created attachment 41532 [details] Xorg.0.log with backtrace
Created attachment 41533 [details] xorg.conf
The problem still exists for the newest xorg/mesa updates (xorg-x11-server-7.6_1.9.3-103.4, Mesa-7.9.802-54.1). It is a blocker to graphics accelaration and 3D-support so that I would personally attribute high prirority to a soon fix.
We don't actively support UMS, please switch to a distro supporting KMS, closing. Reopen if you still have issue with KMS and R600G 3d driver
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