LOL, a few days turned into a few months.
The issue is, why is there no uniform way addressing colour temperature, so that one setting e.g. 4500k translates into the very same colour temperature, regardless what software you use.
While using a simple xrandr script would free some meagre system resources, for now redshiftgui works as I want it, so I keep it for now.
The only issue that I mentioned somewhere is a bug in its settings file.
I even created an empty file that explains the issue to me:
Code: Select all
/home/guest/.redshiftgrc_map_needs_to_be_comma-separated_instead_of_|-separated