Bug 515962 - With HDR and <5% screen brightness, panels become unreadable in dark mode
Summary: With HDR and <5% screen brightness, panels become unreadable in dark mode
Status: RESOLVED DUPLICATE of bug 502651
Alias: None
Product: kwin
Classification: Plasma
Component: colour-management (other bugs)
Version First Reported In: 6.5.5
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2026-02-13 20:29 UTC by aronkvh
Modified: 2026-02-13 22:01 UTC (History)
1 user (show)

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Description aronkvh 2026-02-13 20:29:52 UTC 
SUMMARY
If HDR is enabled, as the screen is lowered panel and plasmoid backgrounds get lighter and lighter, in the end the as light as the foreground. The brightness is the same as the rest. When taking a screenshot, it doesn't show. I tried adjusting min/max HDR brightness but didn't have an effect

STEPS TO REPRODUCE
1. Enable HDR
2. Lower screen brightness

Output: 1 eDP-1 efd88d26-5b49-422a-b003-6a751b915f08
        enabled
        connected
        priority 2
        Panel
        replication source:0
        Modes:  1:2560x1600@165.00*!  2:2560x1600@60.00 
        Geometry: 1920,13 1707x1067
        Scale: 1.5
        Rotation: 1
        Overscan: 0
        Vrr: Automatic
        RgbRange: unknown
        HDR: enabled
                SDR brightness: 930 nits
                SDR gamut wideness: 90%
                Peak brightness: 1450 nits, overridden with: 1450 nits
                Max average brightness: 508 nits
                Min brightness: 0.0006 nits
        Wide Color Gamut: enabled
        ICC profile: none
        Color profile source: EDID
        Color power preference: prefer efficiency and performance
        Brightness control: supported, set to 32% and dimming to 100%
        Color resolution: unknown
        Allow EDR: always
        Sharpness control: unsupported

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 43
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.1
Kernel Version: 6.18.9-200.fc43.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 260 w/ Radeon 780M Graphics
Graphics Processor 1: NVIDIA GeForce RTX 5060 Laptop GPU
Graphics Processor 2: AMD Radeon 780M Graphics
Manufacturer: LENOVO
Comment 1 aronkvh 2026-02-13 20:33:21 UTC 
To be more exact, areas of plasmoids with transparency are affected.
Screen recording: https://big.grin.hu/rPWzjp/PXL_20260213_201922942.RAW.LS~3.mp4
Comment 2 Zamundaaa 2026-02-13 22:01:52 UTC 

*** This bug has been marked as a duplicate of bug 502651 ***