You have to set the virtual size to a large enough dimension in your
/etc/X11/xorg.conf  for example with a 1280x1024 VGA on top of a
1280x800 LCD, you need to declare 1280x1824 virtual dimension. I wonder
why it doesn't do that automatically but by  hand, you simply have to
restart your X server and go back to your xrandr setting.

Section "Screen"
        Identifier      "Default Screen"
        Monitor         "Configured Monitor"
        Device          "Configured Video Device"
        SubSection     "Display"
                Virtual 1280 1824
        EndSubSection
EndSection

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grandr won't set up multiple screens
https://bugs.launchpad.net/bugs/288143
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