Howto lock in Resolution in Xorg.conf

[Jim]

FC12-x86_64/KDE

How can I lock in the 1024x768 resolution in xorg.conf ?

The Option PreferredMode is Ignored , checking in Xorg-0-log.

If I put in Modes "1024x768" it gets changed everytime I reboot.

I'm using the Nvidia driver.

Can't use the nouveau driver, the mouse disappears when waking the 
computer up
after about a half hour of sleep, then I have to restart computer to get 
mouse to reappear.