Cloning is so easy if you know what to do.
# xrandr -q
returns with a list of screens, the connected outputs and available modes. For me LVDS is the internal LCD display and VGA-0 the external output. Using this information
# xrandr --output VGA-0 --same-as LVDS
# xrandr --output VGA-0 --auto

is all I have to do to enable my secondary monitor output within linux. All the xorg.conf editing stuff is useless – xrandr just worked.

I wanted to enable xinerama but my XServer crashed when enabled…

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