Bug 504381

Summary: White artifacts (lines) appearing after waking from sleep with HDR enabled
Product: [Plasma] kwin Reporter: HuManuOïd <67yachts_etables>
Component: colour-managementAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED UPSTREAM    
Severity: normal CC: nate, xaver.hugl
Priority: NOR    
Version First Reported In: 6.3.5   
Target Milestone: ---   
Platform: Fedora RPMs   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description HuManuOïd 2025-05-17 07:54:52 UTC 
SUMMARY
White line artifacts briefly but repeatedly appear on screen after waking the computer from sleep, but only when HDR is enabled.

STEPS TO REPRODUCE
1. Enable HDR in display settings
2. Put the computer to sleep
3. Wake the computer from sleep
4. Observe white line artifacts appearing on the screen

OBSERVED RESULT
White horizontal/vertical lines appear briefly but repeatedly on screen after waking from sleep with HDR enabled.

EXPECTED RESULT
The display should wake normally without any visual artifacts.

SOFTWARE/OS VERSIONS
Windows: N/A
macOS: N/A
Linux/KDE Plasma: Fedora Linux 42
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.0
Kernel Version: 6.14.6-300.fc42.x86_64 (64-bit)

ADDITIONAL INFORMATION
- The issue only occurs when HDR is enabled
- Temporarily changing any display setting (resolution, refresh rate, etc.) fixes the issue as it resets the connection to the monitor
- Graphics Platform: Wayland
- Graphics Processor: AMD Radeon RX 7800 XT
- CPU: AMD Ryzen 7 3700X 8-Core Processor
- Memory: 15.5 GB RAM
- Motherboard: Gigabyte X570 AORUS ELITE
- Connection type: DisplayPort
- Monitor model: GIGA-BYTE TECHNOLOGY CO., LTD. AORUS FI27Q-P
Comment 1 Zamundaaa 2025-05-19 15:35:38 UTC 
Are those lines visible on screenshots, or only on the monitor itself?
Comment 2 HuManuOïd 2025-05-23 18:50:57 UTC 
(In reply to Zamundaaa from comment #1)
> Are those lines visible on screenshots, or only on the monitor itself?

After conducting tests with video capture, I noticed the appearance of white line artifacts on the screen. However, these artifacts were absent in the captured video footage.
Comment 3 Zamundaaa 2025-05-26 13:47:27 UTC 
Ok, then this is a driver bug or GPU quirk. Please report it at https://gitlab.freedesktop.org/drm/amd/-/issues