Edit: This also works in Fedora 16. During the upgrade I had to boot into single user mode to switch to run level 3 and reinstall the latest nVidia drivers. Then switch back to run level 5 and reboot.

When trying to install the latest nVidia drivers on my Fedora 15 workstation, I kept getting errors about the default nouveau video driver being loaded into the kernel. The nVidia installer creates a modprobe config file that is supposed to prevent that module from being loaded but it doesn’t work fully.

To really disable the nouveau driver, you need to edit the grub config file and add the following to the end of the kernel init line:

rdblacklist=nouveau nouveau.modeset=0

For example, your resulting grub.conf file will look like this:

title Fedora (2.6.40.6-0.fc15.x86_64)
        root (hd0,1)
        kernel /vmlinuz-2.6.40.6-0.fc15.x86_64 ro root=/dev/mapper/vg_cline-lv_root noiswmd LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us rhgb vga=794 quiet rdblacklist=nouveau nouveau.modeset=0
        initrd /initramfs-2.6.40.6-0.fc15.x86_64.img