I recently re-installed F8 on my Dell Inspiron 6400 Laptop (Intel Core Due 2.0 GHz,2 GB Ram, NVIDIA Ge 7300 256 MB Video Card) After installing all the updates and rebooting I tried to install the NVIDIA drivers. I tried using the previous driver but it didn't like the new kernel. So I downloaded the new driver... I didn't think it installed properly but it apparently had as the "NVIDIA" logo showed up at boot and I can run compiz and all the 3D stuff. The problem is that my resolution (normally 1680x1050) isn't displaying properly. I have to option using the NVIDIA X server settings to use 1689x1050 at 60 Hz but when I select it my resolution looks more like 1024x768. When I first login the resolution looks correct. But something happens and everything get "bigger" making it look like lower resolution. Any solutions?

post your xorg.conf file

it will be located in the following directory:

/etc/X11/xorg.conf

you can just cat it and copy paste it here.

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 1.0 (buildmeister@builder3) Thu Feb 14 18:20:37 PST 2008
Ok Here is my xorg.conf


# Xorg configuration created by system-config-display

Section "ServerLayout"
Identifier "single head configuration"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Synaptics" "CorePointer"
EndSection

Section "Files"
ModulePath "/usr/lib/xorg/modules/extensions/nvidia"
ModulePath "/usr/lib/xorg/modules"
EndSection

Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "us+inet"
EndSection

Section "InputDevice"
Identifier "Synaptics"
Driver "synaptics"
Option "Device" "/dev/input/mice"
Option "Protocol" "auto-dev"
Option "Emulate3Buttons" "yes"
EndSection

Section "Monitor"
Identifier "Monitor0"
ModelName "LCD Panel 1680x1050"
HorizSync 31.5 - 65.5
VertRefresh 56.0 - 65.0
Option "dpms"
EndSection

Section "Device"
Identifier "Videocard0"
Driver "nvidia"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection

Looks to me your xorg.conf is missing a 'Modes' line.
Your current section looks like this:
Try inserting Modes "1680x1050" like this:

Ok... I gave that a try, but there was no change, I made sure to restart X, and even did a restart but it's still the same. When I first login just as things are starting to load it looks normal, but it switches to the lower resolution soon after. Also it seems like the tops of windows open off screen, Luckily when I run compiz it fixes the windows so they don't open off screen.

I spoke to my local "Guru" and he looked at (after laughing for a while) and said that my screen is actually displaying at 1680x1050... however my font size had been changed. Somewhere between installing the NVIDIA drivers and setting up Compiz Fusion the font size went from 8pt to 12pt thus making everything unnecessarily large. Once I changed the font size to 8pt everything looked normal again. Thanks for the responses...