help with screen resolution settings

[Ken N9VV]

Hi, I have looked all over the web and Ubuntu Help and can't find out 
how to get my systemn --> preferences --> screen resolution to pick up 
on all the possibilities for my video card and monitor. I found the 
915resolution -l command and generated a nice output, but I can't find a 
way to get xorg.conf to pick up all these higher resolution modes. 
Somehow it is stuck at 1024x768x32
any suggestions?
thanks
Ken


sudo 915resolution -l
Intel 800/900 Series VBIOS Hack : version 0.5.2

Chipset: 845G
BIOS: TYPE 3
Mode Table Offset: $C0000 + $4d2
Mode Table Entries: 25

Mode 30 : 640x480, 8 bits/pixel
Mode 31 : 640x400, 8 bits/pixel
Mode 32 : 800x600, 8 bits/pixel
Mode 34 : 1024x768, 8 bits/pixel
Mode 38 : 1280x1024, 8 bits/pixel
Mode 3a : 1600x1200, 8 bits/pixel
Mode 3c : 1920x1440, 8 bits/pixel
Mode 40 : 640x480, 15 bits/pixel
Mode 41 : 640x480, 16 bits/pixel
Mode 42 : 800x600, 15 bits/pixel
Mode 43 : 800x600, 16 bits/pixel
Mode 44 : 1024x768, 15 bits/pixel
Mode 45 : 1024x768, 16 bits/pixel
Mode 48 : 1280x1024, 15 bits/pixel
Mode 49 : 1280x1024, 16 bits/pixel
Mode 4a : 1600x1200, 15 bits/pixel
Mode 4b : 1600x1200, 16 bits/pixel
Mode 4c : 1920x1440, 15 bits/pixel
Mode 4d : 1920x1440, 16 bits/pixel
Mode 50 : 640x480, 32 bits/pixel
Mode 52 : 800x600, 32 bits/pixel
Mode 54 : 1024x768, 32 bits/pixel
Mode 58 : 1280x1024, 32 bits/pixel
Mode 5a : 1600x1200, 32 bits/pixel
Mode 5c : 1920x1440, 32 bits/pixel