

I don’t know if this is still the case, but before Wayland came along, colord was the service that applied ICC profiles to a display. I’m not sure it still works on Wayland though. I feel like DisplayCal should be able to disable it, but you can too:
sudo systemctl stop colord





Does this mean they had to implement bugs from the GNU versions as compatibility features? Do you have a source for that? I’d be interested to read what kinds of things that entails.