The command to achieve your wanted setup is:
xrandr --output VGA --same-as LVDS
** Changed in: displayconfig-gtk (Ubuntu)
Status: Confirmed => Incomplete
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Cannot configure projector connected to laptop with Intel i915 (driver "i810")
using displayconfig-gtk
https://bugs.launchpad.net/bugs/151647
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ubuntu-bugs mailing list
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https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
