[ubuntu] 1680x1050 16:9 & ati external display

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http://ubuntuforums.org – Hello, have a toshiba laptop with ati graphics card hd3650, and i want to connect an external 22' widescreen display.The driver i'm using is fglrx ati non open source drivers, but when i go system->preferences->display the system becomes really slow and the resolution for the external is 1680x1050 16:10, when i want 16:9 aspect ratio not 16:10. please give me some help the result of the lspci -nn |grep VGA is Quote: 01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Mobility Radeon HD 3650 [1002:9591] (Hardware)