Just a quick report on using KDE Plasma Wayland and HDR.
So I use Archlinux and here’s my neofetch:
-` glen@honcho
.o+` -----------
`ooo/ OS: Arch Linux x86_64
`+oooo: Kernel: 6.13.0-rc7-1-mainline
`+oooooo: Uptime: 4 hours, 56 mins
-+oooooo+: Packages: 6207 (pacman)
`/:-:++oooo+: Shell: bash 5.2.37
`/++++/+++++++: Resolution: 2560x1440
`/++++++++++++++: DE: Plasma 6.2.5
`/+++ooooooooooooo/` WM: kwin
./ooosssso++osssssso+` Theme: [Plasma], Breeze [GTK2/3]
.oossssso-````/ossssss+` Icons: [Plasma], breeze [GTK2/3]
-osssssso. :ssssssso. Terminal: konsole
:osssssss/ osssso+++. CPU: AMD Ryzen 9 5900X (24) @ 4.951GHz
/ossssssss/ +ssssooo/- GPU: AMD ATI Radeon RX 7600/7600 XT/7600M XT/7600S/7700S / PRO W7600
/ossssso+/:- -:/+osssso+- Memory: 13050MiB / 31994MiB
+sso+:-
.-/+oso:
++:.
-/+/
.
/
I’m using a BenQ SW270C monitor, and when I switch to HDR mode, the monitor also switches to HDR mode and the BT.2020 color gamut (which is correct for HDR10). To be honest, it doesn’t look that good so I generally switch it to Color Profile None and put the monitor in AdobeRGB mode (which is calibrated in XFCE). I’ll try calibrating it, but I’m not sure that that is possible under Wayland at present. I also have XFCE4 installed, and color calibration while using X works fine with that (even in 10 bpc mode) so I do have a basis for comparison.