[ubuntu] Screen Resolution problem with ATI card on ThinkPad W500

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http://ubuntuforums.org – Hi everyone, I just bought a Lenovo ThinkPad W500 with an ATI Technologies Inc Mobility Radeon HD 3650. The default screen resolution is 1900x1200, however I cannot find a way to decrease it. I've installed the ATI catalyst control center, but even if I change the Screen resolution I see only a shrinked screen with black stripes around it. In the BIOS I have the Discrete card option enabled, and by typing "lspci" I get the correct card controller: "01:00.0 VGA compatible controller: ATI Technologies Inc Mobility Radeon HD 3650&quo (Hardware)