I have an acer aspire3620 and this has also happened to me. Desktop-
effects were working until updates were installed on 09/28/07. Now when
trying to enable the screen flickers and I get  a pop-up saying "desktop
effects cannot enable".


$ compiz
Checking for Xgl: not present. 
Detected PCI ID for VGA: 00:02.0 0300: 8086:2592 (rev 03) (prog-if 00 [VGA])
Checking for texture_from_pixmap: present. 
Checking for non power of two support: present. 
Checking for Composite extension: present. 
Comparing resolution (1280x800) to maximum 3D texture size (2048): Passed.
Checking for nVidia: not present. 
Checking for FBConfig: present. 
Checking for Xgl: not present. 
Starting gtk-window-decorator
/usr/bin/compiz.real (core) - Fatal: No GLXFBConfig for default depth, this 
isn't going to work.
/usr/bin/compiz.real (core) - Error: Failed to manage screen: 0
/usr/bin/compiz.real (core) - Fatal: No manageable screens found on display :0.0


hope this helps

-- 
[gutsy] Regression - "Desktop effects could not be enabled" on ATI Mobility 
Radeon (Thinkpad x31)
https://bugs.launchpad.net/bugs/144077
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