I have Intel graphics and it defaults to RGB Limited on my HDMI display. Iirc Plasma 6 Wayland has a drop-down box for the HDMI color format, but it’s not showing on X11 6.0.4.
On GNOME with GDM, I solved this on multiple distros with putting some proptest commands in /etc/gdm/PostLogin/Default (notes).
I’m wondering if there’s an up-to-date, standard and official location to put such kinds of scripts/commands with SDDM or Plasma 6?
I think I want it applying either xrandr or proptest at both log-in and post-login.