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Have Intel motherboard. Graphics integrated. Ubuntu 12.04 showing to monitors, LVDS n VGA connected, but I have only VGA. And Ubuntu think that my monitor can show FullHD but really it can only 1280*1024. And VGA display was automatically configured to 1280*1024, LVDS - FullHD. And I can see just left half screen on a display. When I'm trying to disconnect LVDS - have a black screen. When I'm trying configure any resolution on any of this displays have an error or black screen randomly. xrandr and manipulation with it, couldn’t help, just a black screen

Once I'm trying to set 1024*768 on VGA display and have a normal screen but very big fonts and icons. In BIOS i can only turn off integated graphic and LVDS. But on motherboard no any PCI or PCI-Ex.

So I wanna set resolution to 1280*1024.

Thank for any help.

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I am not sure if I understood what you have tried correctly, but this is the kind of line you are probably looking for....

xrandr --output LVDS1 --off --output VGA1 --mode 1280x1024
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Sorry for my english. But I tried this before, and get a black screen. – Allivut Apr 23 '13 at 9:33

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