[ubuntu] Screen Resolution Problem

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http://ubuntuforums.org – Hi: I am having the strangest problem...I just got a new Toshiba laptop with AMD A4 Vision Processor and AMD Radeon Graphics Card. On Windows 7, the Screen Resolution is properly set to 900x1600 If i put in an ubuntu 12.04 cd or any other linux distro, it does not go to the proper screen resolution! Everything looks way out of whack and the only choices offered in the settings are 1152x864 1024 x 768 and 800 x 600 When i tried wiping out Windows 7 and installing Ubuntu 12.04 (hoping it would correct on installation and recognize the proper Screen Resolution of 900 x 1600 it on (Hardware)