I had some similar problems with that kernel which i solved by using the noapic and nolapic kernel options. You can turn these on in your grub config. Make sure /boot is mounted, and edit your /boot/grub/grub.conf file. Find the line for your current kernel that looks like this:
'kernel /vmlinuz root=/dev/sda2 '
and append noapic nolapic to the end. Reboot and cross fingers :-)
When I switched to 2.6.10 this problem vanished.
It might be worth doing 'dmesg' just after the machine boots and see if there are any obvious problems. AGPGART would be a possibility as a source of problems. Post the output if you want me to have a look.
Also, try changing your /etc/X11/xorg.conf setting to use the gpl driver 'nv' (or 'vesa') rather than 'nvidia'. Restart X and run it for a couple of hours - does it freeze? If not, then check out the lengthy Nvidia readme (/usr/share/doc/nvidia-kernel-1.0.6629-r1/README.gz) as it is quite comprehensive and has some good troubleshooting hints.
Tim Watson uk
I don't want to switch to another kernel, though... Do you know how much work it took to get everything to work in this kernel?
*Sigh* But you're pretty sure doing so would fix this?
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