I want to refer to the display bug I have with the opensource radeon driver. Alex Deucher commited 9 hours ago a bugfix for the annoying mouse cursor bug. I compiled the driver and replaced the driver from repositories with the homebrew one. It seems like the problem has really been solved. I keep observe this driver-version for some days and hope the problem is gone now.

I wont keep back the way how I created the driver:
- git-clone git://anongit.freedesktop.org/git/xorg/driver/xf86-video-ati
- ./autogen.sh –prefix=/usr
- make
- make install
During the «make»-step I had to add some additional developement packages like mesa-common-dev, xorg-dev and xserver-dev.
Afterwards the files radeon_drv.la, radeon_drv.so, ati_drv.la and ati_drv.so located under /usr/lib/xorg/modules/drivers were updated.
You could also try to replace only the binaries in the last-mentioned directory. I offer you the 4 files for download (No warranty!). http://combatx.net/temp/radeon.tar