You should check your xorg log file.
I think it should be ... /var/log/Xorg.0.log

See what modes it can run and what messages appear for modeline 1024x768



Marty wrote:
> Hi all,
>
> I have a problem with my X configuration on my FC4 install. It will only
> display in 640x480 and 800x600 using the gnome Screen Resolution. When
> looking at my xorg.conf file, I noticed the following:
>
> ~~~~~~~~~~~~
>
> Section "Screen"
> Identifier "Screen0"
> Device "Videocard0"
> Monitor "Monitor0"
> DefaultDepth 24
> SubSection "Display"
> Viewport 0 0
> Depth 16
> Modes "800x600" "640x480"
> EndSubSection
> SubSection "Display"
> Viewport 0 0
> Depth 24
> Modes "800x600" "640x480"
> EndSubSection
> EndSection
>
> ~~~~~~~~~~~~
>
> So, I changed it to:
>
> ~~~~~~~~~~~~
>
> Section "Screen"
> Identifier "Screen0"
> Device "Videocard0"
> Monitor "Monitor0"
> DefaultDepth 24
> SubSection "Display"
> Viewport 0 0
> Depth 16
> Modes "1024x768" "800x600" "640x480"
> EndSubSection
> SubSection "Display"
> Viewport 0 0
> Depth 24
> Modes "1024x768" "800x600" "640x480"
> EndSubSection
> EndSection
>
> ~~~~~~~~~~~~
>
> But, after restarting X, the screen resolution app didn't offer 1024x768
> as a choice.
>
> What am I missing?
>
> Thanks