414415 2019-11-23 08:31:54 +0000 Screen black w/ mouse pointer after unplugging closed-lid laptop from external monitor(s) 2022-11-08 21:00:32 +0000 1 1 4 Plasma plasmashell generic-multiscreen 5.18.0 Kubuntu Linux RESOLVED DUPLICATE 450068 NOR normal 1.0 0 ph plasma-bugs-null aleixpol miltonh26 nate notmart 0 oldest_to_newest 1893031 0 ph 2019-11-23 08:31:54 +0000 Please note: I'm not sure whether this bug is filed under the correct product. SUMMARY Disconnecting an external monitor from a *closed-lid* laptop and _trying_ to continue work on the laptop causes the laptop screen to be black with the mouse pointer. CTRL+ALT+F{2...9} + CTRL+ALT+F1 doesn't help. Only way to get the laptop display working is to either re-connect the external monitor or reboot the laptop. There is NO problem if the laptop lid is open when the disconnection happens which makes me think whether this could have something to do with sleep – when the external monitor is disconnected the laptop goes to sleep, of course, since the lid is closed. Or maybe it's not sleep but it's the lockscreen which is a result of waking from sleep. No idea. STEPS TO REPRODUCE 1. Use an external monitor, laptop lid closed 2. Disconnect the external monitor 3. Try to continue working on the laptop OBSERVED RESULT Screen is totally black with mouse pointer which can be moved EXPECTED RESULT Screen is normal and shows all the usual stuff SOFTWARE/OS VERSIONS Thinkpad T480s Operating System: Kubuntu 19.10 KDE Plasma Version: 5.17.3 KDE Frameworks Version: 5.64.0 Qt Version: 5.12.4 Kernel Version: 5.3.12-050312-generic OS Type: 64-bit Processors: 8 × Intel® Core™ i7-8650U CPU @ 1.90GHz Memory: 23,0 GiB of RAM ADDITIONAL INFORMATION 1893032 1 ph 2019-11-23 08:46:37 +0000 Disabling screen locking after sleep removes the problem. When screen locking is disabled, the laptop wakes with a black screen but either moving the mouse or CTRL+ALT+F2 + CTRL+ALT+F1 makes it normal. 2170774 2 nate 2022-11-08 21:00:32 +0000 *** This bug has been marked as a duplicate of bug 450068 ***