Connect a second screen via HDMI and close the laptop, so that the laptop screen turns off. When you now disconnect the HDMI and then reopen the laptop again, KScreen assumes that the second screen is still there.
Any chance you can test again with KDE Plasma 5.13.x? A lot of multi-screen fixes have went into that version, so it would be nice to know if this has already been fixed.
cannot confirm on neon dev unstable.
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Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!