Hi!
I'm not 100% sure if this is the same issue but when I try to start with the
default settings (without an X conf file) the screen remains black and the
gpu-fan speeds up. After 5 minutes I abort it.
According to the logs the X-Server starts and (for me) there are no suspicious
messages.

As a workaround I put 'Option "AccelMethod" "EXA"' into a X conf file.

My system:
GPU: XFX Radeon HD 7870 GHz Edition (AMD Tathiti)
kernel: 3.11.6-1-ARCH
xf86-video-ati: 1:7.2.0
mesa: 9.2.2
glamor-egl: 0.5.1
X-server: 1.14.3
llvm: 3.3

Should I attach the Xorg.log? What else can I do to track this down?
Thanks in advance