https://bugs.kde.org/show_bug.cgi?id=496850
Bug ID: 496850
Summary: Display gives black screen (no signal) after monitor
powered off then on again
Classification: Plasma
Product: Powerdevil
Version: 6.1.5
Platform: Kubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
SUMMARY
If I turn off my TV (being used as a monitor) for longer than maybe 15 mins,
then when I turn it on again, I just get "no signal". Seems to happen at least
90% of the time.
STEPS TO REPRODUCE
1. Turn off TV using the remote. Or use the "turn off screen" setting in Power
Management.
2. After >15 mins, turn on TV again.
OBSERVED RESULT
TV stays at "no signal". Using keyboard/mouse has no effect. I have to do a
hard power off on my PC by holding down the power button.
EXPECTED RESULT
TV should display the desktop (or lock screen) as usual.
SOFTWARE/OS VERSIONS
Operating System: Kubuntu 24.10
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.6.0
Qt Version: 6.6.2
KERNEL: 6.11.0-9-generic
CPU: Intel Core i5-14600KF
GPU: NVIDIA GeForce RTX 4070 Ti SUPER
GPU DRIVER: NVIDIA 560.35.03
RAM: 32 GB
Display: LG C3 42" OLED TV, connected via HDMI
ADDITIONAL INFO
* I get a similar issue when attempting to resume from Sleep.
* As a workaround, in Power Management settings I prevent the display from
turning off. I also don't use sleep at all. Instead I configure my PC to turn
off (shutdown) after 15 minutes of idle time.
* I don't get this issue on Windows 11 with the same hardware. Sleep also works
correctly in Windows. Therefore it appears this is a software issue, not a
hardware one.
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