https://bugs.kde.org/show_bug.cgi?id=437471

            Bug ID: 437471
           Summary: No lock screen after undocking with lid closed
           Product: kscreenlocker
           Version: 5.10.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: greeter
          Assignee: plasma-b...@kde.org
          Reporter: ereno...@hotmail.com
                CC: bhus...@gmail.com
  Target Milestone: ---

SUMMARY
When undocking from thunderbolt docking station with laptop lid closed, and
opening the lid, the screen is on, mouse pointer is visible. Screen locker is
not visible and desktop cannot be accessed as password cannot be entered.

Going to other TTY console, logging in and killing kscreenlocker_greeter brings
the screenlock window back and then the desktop can then be unlocked. 

STEPS TO REPRODUCE
1. Dock your laptop and close the laptop lid (settings to not standby when lid
closed). Work with your external monitors.
2. Unplug your thunderbolt docking cable while laptop lid is closed. 
3. Open the lid of your laptop, see that mouse pointer is visible, but no
screenlocker window to enter your password.

OBSERVED RESULT
screenlocker window to enter your password is not visible (probably it still
thinks its displaying on external monitors which no longer exist). You can't
enter your password and you can't unlock, hence you can't access your desktop.

EXPECTED RESULT
screenlocker is presented and I can enter my password to access my desktop

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.21.5 / 5.82.0 (latest on Arch as of 20/05/2021)
KDE Plasma Version:  5.21.5 / 5.82.0
KDE Frameworks Version:  5.21.5 / 5.82.0
Qt Version:  5.15.2

ADDITIONAL INFORMATION

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