[ubuntu] Xorg

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http://ubuntuforums.org – Hi im seeking support with creating a xorg.conf file. I am using an eee pc 701 laptop with an intel 910gml chipset. What i want is to be outputting 640x480i @ 30Hz (15khz) so that the screen in my car can accept the video. So far i have been unable to add the above resolution in xrandr using modelines that i generate in cvt or gtf. Using xorg i have been able to add 480i as a resolution in LVDS but not VGA. so in short i need help with making a xorg file to set the VGA output to 640x480i through a screen with no edid or vendor information. [EDIT] Forgot to add I'm using Ubuntu 8.1 (Hardware)