Part one: https://zamundaaa.github.io/wayland/2023/05/18/hdr-and-color-management-in-kwin.html
Part two: https://zamundaaa.github.io/wayland/2023/12/18/update-on-hdr-and-colormanagement-in-plasma.html
Part one: https://zamundaaa.github.io/wayland/2023/05/18/hdr-and-color-management-in-kwin.html
Part two: https://zamundaaa.github.io/wayland/2023/12/18/update-on-hdr-and-colormanagement-in-plasma.html
It maps the colors to be more correct, and it does use the brightness info from the EDID for HDR content, so that checks out.
It might enable some sort of gamut mapping on the display side... HDR on monitors is really weird sometimes.
I think that's a bug in amdgpu. It should force a modeset on hdr change, but it doesn't.