[ubuntu] Screen resolution after install

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http://ubuntuforums.org – I have an issue that has me very confused. I have a generic Intel Atom n450 netbook with the integrated Intel n10 graphics chipset. When I use a live usb to book the netbook, ubuntu detects the screen resolution (1024x600) properly; but after I install ubuntu it detects it as 1024x700. How do I get it to detect the screen resolution properly after the install? Thanks in advance (Hardware)