I have a ATI FX5200, the compiz-fusion used to work properly but after I tried to add a 2nd monitor to extend my desktop the graphics got scrwed up and when i tried to get back to my old config, I manage to do it but compiz is not working properly:

jcruz@Lcp34in72415:~$ compiz --replace
Checking for Xgl: present. 
Checking for nVidia: not present. 
Checking for Xgl: present. 
Enabling Xgl with fglrx ATi drivers...
Starting gtk-window-decorator
/usr/bin/compiz.real (core) - Fatal: Support for non power of two textures missing
/usr/bin/compiz.real (core) - Error: Failed to manage screen: 0
/usr/bin/compiz.real (core) - Fatal: No manageable screens found on display :1.0