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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