Bug 414415 - Screen black w/ mouse pointer after unplugging closed-lid laptop from external monitor(s)
Summary: Screen black w/ mouse pointer after unplugging closed-lid laptop from externa...
Status: RESOLVED DUPLICATE of bug 450068
Alias: None
Product: plasmashell
Classification: Plasma
Component: generic-multiscreen (show other bugs)
Version: 5.18.0
Platform: Kubuntu Linux
: NOR normal
Target Milestone: 1.0
Assignee: Plasma Bugs List
Depends on:
Reported: 2019-11-23 08:31 UTC by ph
Modified: 2022-11-08 21:00 UTC (History)
4 users (show)

See Also:
Latest Commit:
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Description ph 2019-11-23 08:31:54 UTC
Please note: I'm not sure whether this bug is filed under the correct product.

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.

1. Use an external monitor, laptop lid closed
2. Disconnect the external monitor
3. Try to continue working on the laptop

Screen is totally black with mouse pointer which can be moved

Screen is normal and shows all the usual stuff

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

Comment 1 ph 2019-11-23 08:46:37 UTC
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.
Comment 2 Nate Graham 2022-11-08 21:00:32 UTC

*** This bug has been marked as a duplicate of bug 450068 ***