Comment 5 for bug 399451

Awesome thanks. What's going on here is that previously when you had AIGLX off, the system was using software rendering, which works but is very slow (and probably processor intensive) since it is all done in software. Compiz refuses to run with software rendering just as a matter of principle, so that's why it wasn't working. 3D games may work but will be *very* slow.

Now, you've got hardware acceleration enabled, but for some reason it is buggy. Now the compiz wrapper script actually allows the compiz.real binary to start, but it craps out due to a (real) driver bug. You may find other 3D applications also fail during startup.

The good news is now we have something we can forward upstream.