https://bugs.kde.org/show_bug.cgi?id=503318
Bug ID: 503318
Summary: "Night Light" functionality results in really skewed
colors on my external display - first towards
brown/green, then towards red/purple.
Classification: Plasma
Product: kwin
Version: 6.3.4
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: night color
Assignee: kwin-bugs-n...@kde.org
Reporter: v...@vriesk.net
Target Milestone: ---
Created attachment 180626
--> https://bugs.kde.org/attachment.cgi?id=180626&action=edit
drm_info output
SUMMARY
"Night Light" functionality results in really skewed colors on my external
display - first towards brown/green, then towards red/purple.
STEPS TO REPRODUCE
1. Set up some windows with different shades of gray.
2. Turn on "Night Light" in KDE settings, to some temperature lower than 4000K
or so.
OBSERVED RESULT
As observed, grays and blacks start to really get miscolored when night light
comes into play. Up to ~4300K setting or so, they look OK, but then they
receive heavy brown/green tinting which then abruptly changes to red/purple
tinting.
This abruptness is visible both when adjusting the night light temperature to
lower level, or between a color gradient shown on a screen - blacks receive the
final red/purple tinting much earlier than lighter grays.
This can be seen on this video: https://photos.app.goo.gl/K7D1Fauu5FnYRCjB8
Oddly enough, the bad tinting only happens for my external display; laptop's
internal display looks fine.
EXPECTED RESULT
I'd expect the night light to gradually alter the colors of grays without any
strange recolorings.
ADDITIONAL INFORMATION
Possibly related to https://bugs.kde.org/show_bug.cgi?id=500837#c2 ?
Attached `drm_info` output.
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