[CentOS] xorg display problems

Hi all,

Up until today everything has been fine with CentOS on my Toshiba laptop.

I booted into CentOS 4.3 today and Kudzu detected my video card for some 
reason.  I let it configure it (wish I hadn't now).

I can still get in. X and Gnome work.  But the video resolution is 
800x640.  The LCD is capable of 1024x768.  I cannot change it using 
Gnome tools or direct editing of /etc/X11/xorg.conf

With the Gnome "Display" system tool I cannot change the monitor to 
"Generic LCD Display".

Any help you can offer on getting the 1024x768 display mode to work 
again would be appreciated.

Here are the relevant sections from /etc/X11/xorg.conf

Section "Monitor"
         Identifier   "Monitor0"
         VendorName   "Monitor Vendor"
         ModelName    "Unknown monitor"
         HorizSync    31.5 - 37.9
         VertRefresh  50.0 - 70.0
         Option      "dpms"
EndSection

Section "Device"
         Identifier  "Videocard0"
         Driver      "i810"
         VendorName  "Videocard vendor"
         BoardName   "Intel 852"
EndSection

Section "Screen"
         Identifier "Screen0"
         Device     "Videocard0"
         Monitor    "Monitor0"
         DefaultDepth     16
         SubSection "Display"
                 Viewport   0 0
                 Depth     16
                 Modes    "800x600" "640x480"
         EndSubSection
EndSection

-- 
Mike