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When I plug in my second display and activate it in "Displays" I get an "Out of range" error. It says the max desktop size is 1600 by 1600. Does anyone know a fix? I have an AMD/ATI Mobility chipset, and the propriety drivers.

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Ok, I've just found a solution. Firstly, enter this command:

mv ~/.config/monitors.xml ~/.config/monitors.xml.backup

You also need to edit your Xorg config and make the virtual desktop 4096 by 4096:

gksudo gedit /etc/X11/xorg.conf

Afterwards it should look like this

 SubSection "Display"
        Virtual         4096 4096
        Viewport   0 0
        Depth     24

Once you reboot you should be able to use the default display tool or amdcccle to configure it.

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