a second follow up. With DRI it just won't work. Here are my setting which give reasonable speed and no garbage on the screen:
Section "Device" Identifier "Configured Video Device" Driver "radeon" Option "AGPMode" "4" VideoRam 65536 Option "AccelMethod" "EXA" Option "MigrationHeuristic" "greedy" Option "AGPSize" "64" Option "DRI" "off" EndSection
a second follow up. With DRI it just won't work. Here are my setting which give reasonable speed and no garbage on the screen:
Section "Device" stic" "greedy"
Identifier "Configured Video Device"
Driver "radeon"
Option "AGPMode" "4"
VideoRam 65536
Option "AccelMethod" "EXA"
Option "MigrationHeuri
Option "AGPSize" "64"
Option "DRI" "off"
EndSection