Everyone with 32MB memory, please continue to use EXA but add this to 
/etc/X11/xorg.conf under Section "Device":
Option "FBTexPercent" "0"

At least for my Mobility 9000 EXA is completely fine with that. It
pushes the texture memory to system and frees as much memory as possible
for EXA.

If you have eg. only 16MB memory on the gfx card, you may try to be wild and 
try, in addition to FBTexPercent, this:
Option "DepthBits" "16"

It halves the memory usage for depth buffer, causing problems in some 3D
applications but giving even more memory to EXA. Don't know if it's
enough with 16MB RAM but it might be just enough together with
FBTexPercent 0 to have EXA working also on those. If you have 32MB you
might want to experiment it as well, if you find something that is still
slow after setting FBTexPercent.

-- 
[r100-rv200] very poor Xorg performance - XAA solves this
https://bugs.launchpad.net/bugs/363238
You received this bug notification because you are a member of Ubuntu-X,
which is the registrant for xserver-xorg-driver-ati.

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