Did you try to activate the external monitor via xrandr?
Also, there may be some relevant information in the LightDM log files
located in /var/log/lightdm.
** Also affects: lightdm-gtk-greeter (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1796374
Title:
locking session turns off external monitor
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