[ubuntu] Wrong screen resulution

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http://ubuntuforums.org – Ubuntu 12.04 gnome. I can't get the resolution higher than 1280-720. The screen is 22" and has a resolution of 1920-1080. Ubuntu thinks the screen is a laptop screen. a box pop up whit that. the cabel is a blue vga. The resolution has been 1920-1080 for the last year but something happend last week and i don't no what. (Hardware)