Putting simply:
Option "AGPSize" "32"
as suggested by Tormod doesn't work for me.
gnome-appeareance-properties refuses to switch desktop effects on.
If I add:
Option "BusType" "PCI"
desktop effects can be enabled but gdm is unstable: the screen gets all black
if I open a few firefox windows.
Increasing AGPSize to 64 works but I get a kernel panic few minutes
after logon if I open several windows.
To have a stable system I have to put all the options below in the
Device section:
Section "Device"
Driver "ati"
Identifier "Radeon 9200"
Option "BusType" "PCI"
Option "AccelMethod" "EXA"
Option "MigrationHeuristic" "greedy"
Option "AGPSize" "64"
EndSection
--
(Needs KMS) Background and full screen apps don't show up when Normal Visual
Effects on (Radeon 7500)
https://bugs.launchpad.net/bugs/444139
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which is the registrant for xserver-xorg-driver-ati.
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