Why can I only do 1152x864 in KDE?

[Andrew Konosky]

My system can do up to 1920x1440 resolution, but I usually run my 
desktop at 1152x864. I tried to raise it up to 1280x960 just now, and 
1152x864 is the highest the KDE control panel will go. Also, it is set 
to use display1, and it's greyed out so i can't change it. I went into 
the xorg.conf file and added all my resolutions up to 1600x1200 and 
logged out and back into KDE again, but still no higher resolutions? 
Whats up with this?