Re: glxgears makes x to crash
I don't recognize any problems in the log.
Have you tried running nvidia's agp support rather than agpgart? This is controlled by the option "NvAGP" in the device section of the config.
Option "NvAGP" "1"
Check whether the option is rejected in the log, and cat /proc/driver/nvidia/agp/status to see which driver is functioning.
"..the triumph of evil is for good men to do nothing."
VIDIA video driver RPMs for Fedora
:: see yum repo at livna.org