Bug 484900

Summary: external display being powered off is not detected
Product: [Plasma] kwin Reporter: fanzhuyifan
Component: multi-screenAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED NOT A BUG    
Severity: normal CC: xaver.hugl
Priority: NOR    
Version First Reported In: git master   
Target Milestone: ---   
Platform: Other   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description fanzhuyifan 2024-04-02 03:23:42 UTC 
SUMMARY


STEPS TO REPRODUCE
1. connect external display via HDMI
2. power off external display (not disconnect, poweroff)

OBSERVED RESULT
In system settings - displays, the powered off external display is still shown.

EXPECTED RESULT
The powered off external display is disabled.

SOFTWARE/OS VERSIONS

Operating System: Arch Linux 
KDE Plasma Version: 6.0.80
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0
Kernel Version: 6.8.2-arch2-1 (64-bit)
Graphics Platform: Wayland
Processors: 20 × 13th Gen Intel® Core™ i9-13900H
Memory: 15.2 GiB of RAM
Graphics Processor: Mesa Intel® Graphics
Manufacturer: ASUSTeK COMPUTER INC.
Product Name: ROG Zephyrus G16 GU603VV_GU603VV
System Version: 1.0
ADDITIONAL INFORMATION
Comment 1 fanzhuyifan 2024-04-02 04:58:58 UTC 
For me, this also happens on X11. I am using intel iGPU with NVIDIA dGPU, and the hdmi port should be driven by the nvidia GPU.
Comment 2 Zamundaaa 2024-04-02 11:40:16 UTC 
This is just how HDMI works, there's nothing we can do about it