[ubuntu] Laptop screen resolution

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http://ubuntuforums.org – I am trying to install Ubuntu on a Asus X58C laptop. Everything is working fine except the screen resolution. I automaticly detects a resolution of 800 * 600, but the resolution I want to use is 1280 * 800. I can't choose this resolution because this resolution isn't in the list I can choose from. I am using Ubuntu version 9.10. The graphical adapter is UMA and the chipset SiS M672. Does someone know how to fix this. (Hardware)