https://bugs.kde.org/show_bug.cgi?id=461648
Bug ID: 461648
Summary: Primary display is not detected after waking from
sleep
Classification: Plasma
Product: KScreen
Version: 5.26.2
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: rocking...@proton.me
Target Milestone: ---
Created attachment 153636
--> https://bugs.kde.org/attachment.cgi?id=153636&action=edit
Output of the command "journalctl -xe -b"
SUMMARY
I have a laptop with Nvidia graphics, with external display set as primary
display and laptop display disabled.
After Plasma update from 5.25.5-4 to 5.26.2-1, the primary display is not
detected after system wakes from sleep or the display wakes from energy saving.
Instead I get a blinking laptop display and no signal on the external display.
The only way to bring back the primary screen was to select "Unify outputs" in
the display options. However this method works unreliably.
STEPS TO REPRODUCE
1. Connect the external display to the laptop with Nvidia GPU. Set Nvidia
primary GPU (in case of hybrid graphics).
2. Set the external display as primary. Disable the built-in display.
3. Wait until the external display enters power saving, or system goes to
sleep.
4. Wake the display or the system from sleep (e.g. by moving the mouse
pointer).
OBSERVED RESULT
External display is not detected
EXPECTED RESULT
External display is detected
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Manjaro Linux
KDE Plasma Version: 5.26.2
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.6
libkscreen Version: 5.26.2-1
Nvidia Driver Version: 520.56.06
ADDITIONAL INFORMATION
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