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I am not sure what setting to change for this but I open games like Dungeon Crawl or a Steam game and the game wants to take up both screens. Is there a way to have the game open just on one screen xrandr shows this. So they are both on Screen 0:

Screen 0: minimum 320 x 200, current 2966 x 900, maximum 8192 x 8192

LVDS1 connected 1366x768+1600+75 (normal left inverted right x axis y axis) 344mm x 193mm

VGA1 connected 1600x900+0+0 (normal left inverted right x axis y axis) 443mm x 249mm

If you need any more info or can point me to a place you may have already found an answer please let me know.

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I have two monitors connected to my Xubuntu 14.04 machine right now and encountered the same problem. I think that the best way to fix this is through a script file, so that you don't have to enter the commands every time you want to play the game.

I have written a script file that, among other things, will fix the Dungeon Crawl Tiles window to consume only one desktop, instead of spanning across two. You may download or view it here.

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I don't think there is any clean solution to this right now. The easiest workaround is to use xrandr and set it to only use one monitor before starting the game with:

xrandr --output LVDS1 --off

And when you are done with the game reenable both monitors with:

xrandr --output LVDS1 \
         --mode "1366x768" \
         --panning 1366x768+1600+75 \
       --output VGA1 \
         --mode "1600x900" \
         --panning "1600x900+0+0"

Another alternative is to start the game in a window-mode and then remove the screen border with some hackery. I have written a tool for that, available at:

But it's not really end-user ready or anything. You use it like this (move you mouse pointer over the game window before the 2 seconds ran out):

sleep 2 && ./ -keep-above 1 --decorations 0 -m 1366,0 ACTIVE

If the game doesn't provide a resolution that fits your desktop, you can use xrandr to set your monitor to a resolution that fits the game.

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