I also have desktop-effects / compiz running in Feisty, in an Asus L3000 laptop 
with an ATI Radeon 7500 @ 1400x1050x16. In the live ubuntu 7.10 beta desktop, I 
noticed that:
- direct rendering isn't working by default
- the appearance application has the 'normal' setting selected, but no 
desktop-effects running.
- starting compiz manually gave the "/usr/bin/compiz.real (core) - Fatal: No 
GLXFBConfig for default depth, this isn't going to work" message.

I followed the suggestion regarding the load order of the modules (load dri, 
then radeon); upon inserting dri, received several messages from the kernel 
regarding missing symbols (didn't take notes, I'll try to replicate that and 
update here).
- direct rendering is working ok
- Trying to start compiz would now gives the "Comparing resolution (1400x1050) 
to maximum 3D texture size (512): Failed." message.

Is it possible that there are 3 bugs here? (dri module, load order, and
3D texture)

-- 
[gutsy] Regression - "Desktop effects could not be enabled" on ATI Mobility 
Radeon
https://bugs.launchpad.net/bugs/144077
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Bugs, which is the bug contact for Ubuntu.

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