Im having a similar problem. I have a ThinkPad T520, running xfce 4.12
on ubuntu 18.04.
I have tried this command with and without '--auto':
'xrandr --output LVDS-1 --auto --same-as DP-1-1'
Here is my xrandr output:
Screen 0: minimum 320 x 200, current 1600 x 900, maximum 8192 x 8192
LVDS-1
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
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