Ever since upgrading my desktop, I've been fighting with my video card. At last, after a hardware upgrade, I got metacity working, but only because I removed compiz completely. However, I can't get 3D hardware acceleration to work. Checking, hardinfo tells me that both the nvidia and the nouveau modules are running (which might explain things) even though I added rdblacklist=nouveau nomodset to my kernel line.
Leigh's guide for F 12 gives some instructions about removing the nouveau driver completely and rebuilding inetrd, but I don't know if that applies to F 13. In fact, this conflict may have been the issue from the beginning, but it was impossible for me to tell until too late.
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