Maybe the system is remembering the external monitor as a configuration
where the laptop screen was once turned off. So switching to that
configuration involves turning off the laptop screen. To fix that try
deleting all memory of the monitor configurations:
rm ~/.config/monitors.xml
** Package changed: xorg (Ubuntu) => mutter (Ubuntu)
** Tags added: multimonitor
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1903829
Title:
laptop screen turns off when I connect an external monitor
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