I’m so done with win11, and currently 12 of my 15 machines are linux anyway, but AFAIK HDR (on nvidia gpu) is still impossible? Are you guys all on AMD or just not using hdr for gaming/media? So instead of relying on outdated info, just asking the pros :)
You may have to enable HDR for Linux on each monitor individually from the display settings, and then enable HDR for the game itself from within its own settings.
I only have 1 (large) monitor. I toggle it on and everything looks like butt. Then toggle it off and it looks normal again. It’s an HDR OLED display.
If you’re on KDE, you can use the “sRGB color intensity” to quickly test if your content (e.g. via mpv or Proton) is really in HDR.
If the content changes while going from minimum to maximum in “sRGB color intensity”, it’s SDR, if it does not change, it’s HDR.
I also have an OLED monitor and HDR looks fantastic on KDE.