I am using xfce 4.12 on Ubuntu 18.04 and am having a similar issue.
However, on startup, my laptop screen is mirrored on the intended
external monitor just before I reach lightdm. xrandr detects the monitor
however running 'xrandr --output <> --same-as <>' results in no effect
with no error messages or anything. When viewed through xfce4-settings-
manager, the external monitor shows up but is grayed out and is labeled
'(disabled);

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https://bugs.launchpad.net/bugs/1497806

Title:
  Mirrored display broken in Xubuntu

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