I asked for help in the ubuntu forums:
http://ubuntuforums.org/showthread.php?t=267836
As suggested there, in addition to he options I already added, I put these also
into my xorg.conf
Option "DRI" "true"
Option "ColorTiling" "on"
Option "EnablePageFlip" "true"
Option "AccelMethod" "EXA"
So my device section looks like that:
Section "Device"
Identifier "ATI Technologies, Inc. M24 1P [Radeon Mobility X600]"
Driver "radeon"
BusID "PCI:1:0:0"
Option "NoAccel" "false"
Option "AGPMode" "8"
Option "AGPFastWrite" "on"
Option "DRI" "true"
Option "ColorTiling" "on"
Option "EnablePageFlip" "true"
Option "AccelMethod" "EXA"
EndSection
With this config everything works well!
--
Very bad performance with X600 in Edgy
https://launchpad.net/bugs/62768
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