When I run the command "SKIP_CHECKS=yes compiz" I get the following output.

w116tjb@w116tjb-desktop:~$ SKIP_CHECKS=yes compiz
Checking for Xgl: not present.
Detected PCI ID for VGA: 01:00.0 0300: 1002:5d52 (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 (1280x1024) to maximum 3D texture size (2048): Passed.
Checking for nVidia: not present.
Checking for FBConfig: present.
Checking for Xgl: not present.
Starting emerald
/usr/bin/compiz.real (video) - Warn: No 8 bit GLX pixmap format, disabling YV12 image format
It's gets to that last line, which is a warning, and hangs indefinitely. Any ideas?