https://bugs.kde.org/show_bug.cgi?id=413800
Bug ID: 413800
Summary: External screen goes off for no reason
Product: KScreen
Version: 5.17.1
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: ci3...@gmail.com
Target Milestone: ---
SUMMARY
Since a few month (Plasma 5.16 and 5.17), I have the problem that my external
screen goes off every time it should be activated automatically.
Here are the detailed information:
The setting is the following: I have a laptop (Thinkpad T470) and an external
screen (Dell U2715H) connected via Displayport the the dock of the laptop.
Normally, the laptop screen is active. However, when plugged into the dock, I
want that the laptop screen is disabled and the external screen become the main
monitor.
STEPS TO REPRODUCE
1. Plug the laptop into the dock.
OBSERVED RESULT
1. The external screen goes on, the internal screen goes off.
2. After a few seconds, the external screen goes off as well, leaving me with
two turned off screens.
3. Take the laptop off the dock turn the laptop screen on again (often crashing
kwin, sometimes plasmashell, too).
EXPECTED RESULT
1. The external screen goes on, the internal screen goes off.
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma: Gentoo with Linux 4.19.72
(available in About System)
KDE Plasma Version: 5.17.1 (was present with 5.16 as well)
KDE Frameworks Version: 5.63.0
Qt Version: 5.12.5
ADDITIONAL INFORMATION
Workaround: My workaround is to open the systemsettings when the laptop is not
yet in the dock, then plugging it into the dock and change very very fast the
configuration so the laptop monitor is on as well. After applying, the external
monitor usually goes off anyway, but sometimes not. However, the laptop monitor
is always on then. Then I switch back the setting to "external monitor on,
laptop monitor off" and apply. Now the behaviour is as expected.
There was a time where the behaviour was not present. However, I'm not sure,
when this was. This was sometime in the lifetime of Plasma 5.16 (I'm pretty
sure, this was not related to a Plasma update).
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