i have a gateway AMD athlon x2 dual core:

specs: ATI Radeon HD 3200 graphics
With up to 1919MB of HyperMemory supporting Shader Model 4.0 and Microsoft DirectX 10.0. HDMI interface for connecting to an HDTV.

compiz fusion dont work:

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 (1366x768) to maximum 3D texture size (8192): Passed.
Checking for Software Rasterizer: Not present.
Checking for nVidia: not present.
Checking for FBConfig: present.
Checking for Xgl: not present.
/usr/bin/compiz.real (core) - Error: Could not acquire compositing manager selection on screen 0 display ":0.0"
/usr/bin/compiz.real (core) - Fatal: No manageable screens found on display :0.0