There is screen corruption whith the SVGA server for a Savage $ AGP screen card. Options "no_accel" fixes it, but it is slow. Reeinstalling the XFree86_SVGA driver from RedHat 6.2 fixes the problem. It looks to be like a compilation bug as the server version is the same (3.3.6)
A possible fix is in the works... don't change that channel. *** This bug has been marked as a duplicate of 17991 ***