Created attachment 144571 [details]
Xorg log (radeon DDX + AccelMethod glamor)
With the radeon DDX and the following xorg.conf:
rui@turionx2:/etc/X11$ cat xorg.conf
Section "Device"
Identifier "Radeon"
Driver "radeon"
Option "AccelMethod" "glamor"
EndSection
rui@turionx2:/etc/X11$
I get the exact same corruption. Log attached.