I’ve been having issues with my display colors on KDE Neon (using X11) running KDE Plasma 5.27.6, the display colors look washed out compared to Windows 11 and Ubuntu 22.04 (with X11).
Some info that might be useful is that I tried other distros: Fedora 37 & 38 with GNOME, EndeavourOS with KDE and Kubuntu 22.04 (also tried to install KDE on vanilla Ubuntu. Color management worked on Gnome but not on KDE). Color management did not work in these either. One thing I noticed though, is that the color profile did seem to apply to some images in Firefox (but I was expecting it to apply to the whole display)
Another thing I noticed was that on Ubuntu 22.04 every single color profile I selected worked, in any other distro only the Blue profile works.
I’m using an AMD Radeon RX 5600 XT.