https://bugs.kde.org/show_bug.cgi?id=469277
Bug ID: 469277
Summary: Black screen after going out of suspend when external
screen is attached
Classification: Plasma
Product: KScreen
Version: 5.27.4
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: ahmed....@tutanota.com
Target Milestone: ---
SUMMARY
***
My laptop is attached to external screen through HDMI cable, and "Display
Layout" is set to "Expand to right", but after I suspend the laptop when it is
attached to external screen, the screen of the laptop does not display anything
after going out of suspend.
***
STEPS TO REPRODUCE
1. Attach external screen to a laptop through HDMI cable.
2. Choose "Expand to right" from "Display Layout".
3. Suspend the laptop.
4. Turn on the laptop again.
OBSERVED RESULT
On the lock screen only the cursor appears and nothing else, but when I detach
the external screen then suspend the laptop and turned it on again, the laptop
screen works normally.
EXPECTED RESULT
The laptop screen to turn on again after going out of suspend.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 23.04
KDE Plasma Version: KDE Plasma 5.27.4
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8
ADDITIONAL INFORMATION
My wild guess: "Display Layout" is set to external monitor, which is an option
that is not selected previously. Moreover, the external screen is turned off
and KDE Plasma is not aware of that and choose to use the external monitor
only, which is the worst option in this situation. Furthermore, I can not
change "Display Layout" when the HDMI cable is not attached, which add more
complications to this issue.
Finally, to be more clear, I use Wayland, but I encountered this issue before
when using X11.
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