Plasma 6 still does not support icc profiles for displays. This is a serious limitation to its use.
Under wayland the screen is not detected
Under X11 the screen is detected as shown in the following screenshots
In both cases it is impossible to add an icc profile
I moved to Kubuntu 24.04
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Hmmh, it seems the colour management kcm was regressed with plasma6 and colour profile support is still rudimentary and it depends if you use the wayland or xorg backend for plasma.
On wayland look into the display settings. There’s a section where you can apply your icc.
On xorg, you can work around by creating a starter in autostart.
the latter works for me on FreeBSD, so ymmv.
Thanks very much for this information. I managed to use a profile under wayland
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