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I have intel gma 945 and when i tried to change the resolution to 1024x600 (16.9) it comes with error.

Note:At the moment it's setted on 800x600 (4.3),which gives you black borders and it's not full widescreen.

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You have to specify the resolution first. use the following command on terminal. to declare the needed resolution use..(copy and paste and enter it on terminal):

xrandr --addmode S-video 1024x600

Then to use the resolution copy, paste and enter the following command:

xrandr --output S-video --mode 1024x600 
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