https://bugs.kde.org/show_bug.cgi?id=493162
Bug ID: 493162
Summary: Lowered Color Depth with lower refresh rate in HDR
Classification: Plasma
Product: kwin
Version: 6.1.5
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: colour-management
Assignee: kwin-bugs-n...@kde.org
Reporter: hun...@protonmail.com
Target Milestone: ---
SUMMARY
In HDR Mode, when refresh rate is changed from native 120 Hz to a lower refresh
rate the color depth gets lowered too. When in 120 Hz the color depth looks the
same as when running Windows (10 Bit). With 60 Hz it looks like 6 Bit color
depth.
STEPS TO REPRODUCE
1. HDR enabled and monitor set to native refresh rate
2. Lower refresh rate to something like 60 Hz
OBSERVED RESULT
Really bad color banding, looks like 6 Bit color depth.
EXPECTED RESULT
Same color depth as native refresh rate, in this case it should be 10 Bit
SOFTWARE/OS VERSIONS
Operating System: CachyOS Linux
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.5.0
Qt Version: 6.7.2
Kernel Version: 6.10.10-2-cachyos-lto (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5800X3D 8-Core Processor
Memory: 62.7 GiB of RAM
Graphics Processor: AMD Radeon RX 7900 XTX
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