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Forked from anonymous/gist:4344533
Created December 20, 2012 10:41
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Add the following lines in /etc/gdm/Init/Default
just before "exit 0" statement
xrandr --output HDMI3 --same-as LVDS1
xrandr --output HDMI3 --auto
replase HDMI3 with your external display
and LVDS1 with your internal display
reboot.
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