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
--
[RV100] very poor Xorg performance on various older graphics HW - XAA no longer
works
https://bugs.launchpad.net/bugs/363238
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which is the registrant for xserver-xorg-driver-ati.
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