Settings are clear(X11).
“Work” is: wallpaper, menus (not important), RT → System Profile, DT → System Profile, and a least ONE image viewer (Xnview, EOG, or…).
If you have multiple devices, another colormanager (e.g. xiccd) maybe is active.
With much handworking, openbox does this. In any other environment, including KDE, one of the points does not work.
Gnome 3.x had a CONSISTENT colormanagement. Maybe it is an gtk4 issue. If one is searching in the Web, the lack of Interest leads often to “Linux sucks” or “Linux Colormanagement sucks”.
By the way, maybe Mate or Cinnamon does?
Sorry for may bad english…
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