I have notice a strange behavior : compiz doesn't use direct rendering
on my system whereas it's capable of. Compiz doesn't detect
texture_from_pixmap at is usualy do.

[EMAIL PROTECTED]:~$ compiz --replace > /tmp/compiz.log 
/usr/bin/compiz.real (video) - Warn: No 8 bit GLX pixmap format, disabling YV12 
image format
[EMAIL PROTECTED]:~$ cat /tmp/compiz.log 
Checking for Xgl: not present. 
Detected PCI ID for VGA: 
Checking for texture_from_pixmap: not present. 
Trying again with indirect rendering:
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. 
[EMAIL PROTECTED]:~$ glxinfo | grep direct
direct rendering: Yes

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compiz gives white screen on radeon 3650
https://bugs.launchpad.net/bugs/262529
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