Comment 7 for bug 80734

I think this is not a desktop-effects issue, because enabling compiz directly from the command line has the same issue.

emilio@kiko:~$ compiz.real --replace
libGL warning: 3D driver claims to not support visual 0x5b
compiz.real: GLX_EXT_texture_from_pixmap is not supported by direct rendering context, trying indirect rendering context instead
compiz.real: No stencil buffer. Clipping of transformed windows is not going to be correct when screen is transformed.
Terminated
emilio@kiko:~$

I think the problem is with the video drivers. In my case, I have an intel gma 915, with the i810 driver (feisty up-to-date).

emilio@kiko:~$ glxinfo
name of display: :0.0
libGL warning: 3D driver claims to not support visual 0x5b
display: :0 screen: 0
direct rendering: Yes

I'm changing the package to compiz, but correct it if I'm wrong.