Hi there,
first, I hope i write to the right place (I found this post via Google on dri-devel - http://permalink.gmane.org/gmane.comp.video.dri.devel/78714), if not - sorry for the noise.
Problem description - 3d load causes lockup. 3d games like OpenArena or Urban Terror are perfectly playable for few minutes and then the graphic stack lockups with the message "ATI RV620: GPU lockup CP stall for more than 10000msec" in dmesg log. The computer is accessible via network (ssh) after the lockup.
Booting with radeon.wb=0 helps, as there is no lockup.
Same behavior with vanilla kernel 3.5.0, vanilla 3.8rc5 and Fedora 18 kernel 3.7.2-201.fc18. So it looks like the problem was introduced somewhere else, as with older 3d/graphic stack in Fedora 17 it worked without this problem.
Xorg is in version xorg-x11-server-Xorg-1.13.1-4.fc18.x86_64
The GPU is: 01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV620 [Mobility Radeon HD 3400 Series]
Dmesg logs should be in attachment.
Many thanks
Matej Zary