https://bugs.kde.org/show_bug.cgi?id=497167
Bug ID: 497167
Summary: Unable to Switch Display Output to External Monitor in
Display Configuration
Classification: Plasma
Product: KScreen
Version: 6.2.4
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: OSD and Plasma applet
Assignee: kscreen-bugs-n...@kde.org
Reporter: rocking...@proton.me
Target Milestone: ---
SUMMARY
Unable to switch from the laptop screen to an external monitor connected via
DisplayPort, despite the external monitor being correctly displayed in the
System Settings' Display Configuration.
Switching from the external monitor back to the laptop screen works without
issues.
A workaround involves running the following xrandr command:
$ xrandr --output DP-2 --mode 2560x1440 --rate 164.83 --primary --output
eDP-1-1 --off
Occasionally, this command must be run twice — once to wake the external
monitor from sleep and again to fully activate it.
STEPS TO REPRODUCE
1. Connect an external monitor to a laptop via DisplayPort.
2. Activate only the laptop screen and deactivate the external monitor.
3. Select the "Switch to external screen" option in the System Tray's Display
Configuration.
OBSERVED RESULT
The laptop screen turns off.
The external monitor remains in sleep mode and does not turn on.
It seems that Kscreen considers the switch successful, but the external monitor
stays inactive. To recover, the external monitor must be turned off and on
again, which restores the desktop to the laptop screen.
EXPECTED RESULT
The external monitor should wake from sleep and display the desktop as
expected.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Manjaro KDE Stable
KDE Plasma Version: 6.2.4
KDE Frameworks Version: 6.8.0
Qt Version: 6.8.1
ADDITIONAL INFORMATION
Graphics Platform: X11
Graphics Adapter: Nvidia TU106M + Intel UHD Graphics 630, Nvidia set as primary
GPU
Graphics Driver Version: 550.135
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