Instalei o driver usando o Envy e o glxinfo | grep direct indicou yes
Mas quando eu uso SKIP_CHECKS=yes compiz retorna um warn.
Checking for Xgl: not present.
Detected PCI ID for VGA: 01:05.0 0300: 1002:5a61 (prog-if 00 [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 (1440x900) 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 (video) - Warn: No 8 bit GLX pixmap format, disabling YV12 image format
Mesmo assim já dá para perceber alguns efeitos