~$ compiz --replace
Checking for Xgl: not present. 
Detected PCI ID for VGA: 01:00.0 0300: 10de:0402 (rev a1) (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 (2560x1024) to maximum 3D texture size (8192): Passed.
Checking for nVidia: present. 
Checking for FBConfig: present. 
Checking for Xgl: not present. 
Starting emerald
Segmentation fault (core dumped)

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