Removing the X Windows Display size error on Suse 9.1 and Dell Inspiron 5100

Everytime I logged into KDE X windows presented me with a problem saying that the display had not reported it's size properly.  I measuered the display with a tape measure, (305mm*230mm) and entered these manualy into SAX2 after entering the display type as a Dell 1024x Laptop Display.