color temperature derived from the "night light" settings.VCGT table of the currently enabled color profile (retrieved via colord).That method is normally called by the gsd-color daemon (indirectly), and currently there are two things that can affect its arguments: this method is already called by another daemon, so the effect is only temporary.the value is not saved anywhere so the effect is not persistent.Yet it's not how gnome-gamma-tool achieves it's purpose because: Mutter, however, exposes the SetCrtcGamma method via D-Bus, and that method really works. Mutter (GNOME's compositor) does not implement any Wayland protocols that could help, so tools like gammastep or wl-gammactl won't work.
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