After upgrading to xorg-server-1.7.1 and xf86-video-ati-6.12.4 starting compiz will crash the X server (actually it is gtk-window-decorator that triggers the crash). I'm using the radeon driver on radeon x800 hardware. Reproducible: Always Steps to Reproduce: 1. X :0 2. DISPLAY=:0 compiz --indirect-rendering & 3. DISPLAY=:0 gtk-window-decorator & Actual Results: X crashes (segfault) Expected Results: X doesn't crash ;-)
The problem turned out to be a null pointer dereference in xf86-video-ati. It is already fixed in freedesktop.git. Patching xf86-video-ati-6.12.4 with http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/commit/?id=78fcbf577ad6eba6399cc39f74b7ce5f9c8e265e fixes the problem for me.
Fixed by xf86-video-ati-6.12.5. Thanks for the bug. And headsup what the fix is.