https://bugs.kde.org/show_bug.cgi?id=527151
Bug ID: 527151
Summary: Night Light tints white content teal/green instead of
warm yellow with "Prefer color accuracy" (6.8.0
regression, EDID built-in profile)
Classification: Plasma
Product: kwin
Version First 6.8.0
Reported In:
Platform: CachyOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: night color
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
DESCRIPTION
After upgrading kwin 6.7.5 -> 6.8.0 (pacman log, 2026-10-15: kwin 6.7.5-3.1 ->
6.8.0-1; no other color-stack package changed), Night Light (Mode=Constant ,
3000K) turns white backgrounds a teal/greenish color instead of warm yellow.
STEPS TO REPRODUCE
1. Wayland session, SDR, display color profile "Built-in", Color accuracy
"Prefer color accuracy", no ICC profile, HDR off
2. Enable Night Light at 3000K
3. Open anything white (e.g. a blank page)
OBSERVED RESULT
Whites shift teal/green rather than warm.
EXPECTED RESULT
Warm yellowish shift, as in 6.7.5.
SOFTWARE/OS VERSIONS
Operating System: CachyOS Linux
KDE Plasma Version: 6.8.0
KDE Frameworks Version: 6.31.0
Qt Version: 6.12.0
ADDITIONAL INFORMATION
Switching Display Configuration -> Color accuracy to "Prefer performance" on
all outputs restores the correct yellow tint: the legacy per-channel multiplier
path is fine, the color-managed path computes a wrong white-point adaptation.
Setting the color profile to "None" instead of "Built-in" changes nothing.
GPU: NVIDIA RTX 3080 Ti, driver 615.78.08, OpenGL ES compositing.
Three outputs, all with "Color profile source: EDID" and no ICC profile
(kscreen-doctor):
* HDMI-A-1 BenQ 2560x1440: R 0.660/0.331 G 0.300/0.632 B 0.148/0.055 (slightly
wide gamut)
* HDMI-A-2 Samsung 1920x1080: ~ sRGB primaries
* DP-2 LG 2560x1440 10bpc: R 0.686/0.309 G 0.265/0.668 B 0.150/0.058 (wide
gamut)
Possibly related: bug 527129 (6.8.0 color pipeline regression direct scanout
path) and MR !10042 (6.8 color pipeline shader changes).
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