SUMMARY Night Color is not working with kwin 6.3.1. STEPS TO REPRODUCE 1. Activate night color using settings/tray OBSERVED RESULT Night color is not activating, there is no perceptible color shit. EXPECTED RESULT Night color activates, shifting the colors on the screen. SOFTWARE/OS VERSIONS kinfo: Operating System: EndeavourOS KDE Plasma Version: 6.3.1 KDE Frameworks Version: 6.11.0 Qt Version: 6.8.2 Kernel Version: 6.12.15-1-lts (64-bit) Graphics Platform: X11 Processors: 16 × AMD Ryzen 9 7940HS w/ Radeon 780M Graphics Memory: 14.8 GiB of RAM Graphics Processor 1: AMD Radeon 780M Graphics Processor 2: zink Vulkan 1.4 ADDITIONAL INFORMATION Night light doesn't work when using Built-in or None as color profiles. Using an ICC profile does work but since kwin 6.3 it has been hurting my eyes so I switched to the build-in profile. For now I've simply downgraded to kwin-6.3.0-5 from the pacman cache. This solved the issue night light using the built-in color profile.
I haven't noticed the "Color accuracy" option that's been added, it seems that selecting "Prefer efficiency" allows night light to work. It's only when "Prefer color accuracy" is selected that there are issues.
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/7199
Git commit 7b0433ba640efc8cb29409c32ff26a4343b895c3 by Xaver Hugl. Committed on 19/02/2025 at 17:08. Pushed by zamundaaa into branch 'master'. backends/drm: use a shadow buffer with "prefer color accuracy" if night light is enabled Otherwise there's no way night light could be applied M +4 -2 src/backends/drm/drm_output.cpp https://invent.kde.org/plasma/kwin/-/commit/7b0433ba640efc8cb29409c32ff26a4343b895c3
Git commit 7595680ad7b9f10b3cd21b6ad3076da42ce72faf by Xaver Hugl. Committed on 19/02/2025 at 17:25. Pushed by zamundaaa into branch 'Plasma/6.3'. backends/drm: use a shadow buffer with "prefer color accuracy" if night light is enabled Otherwise there's no way night light could be applied (cherry picked from commit 7b0433ba640efc8cb29409c32ff26a4343b895c3) Co-authored-by: Xaver Hugl <xaver.hugl@gmail.com> M +4 -2 src/backends/drm/drm_output.cpp https://invent.kde.org/plasma/kwin/-/commit/7595680ad7b9f10b3cd21b6ad3076da42ce72faf
*** Bug 500617 has been marked as a duplicate of this bug. ***
*** Bug 500526 has been marked as a duplicate of this bug. ***
I'm on an Arch Linux based system running KDE Plasma 6 in X11. Since the kwin update to 6.3.2.1-1, Night Light has a stark green/purple hue instead of red/orange. I believe the color accuracy option is not available on X11.