https://www.gamingonlinux.com/2023/12/proton-experimental-hdr-mass-effect-legendary-edition-and-injustice-2/
Valve put up a brand new release of Proton Experimental for Steam Deck and Desktop Linux, which brings a sprinkle more HDR and some great bug fixes.
Are there any distro besides steamis (and by extension chimera) that's support hdr? Or do you just need to launch the game in full screen so it takes over?
I know that KDE is working on HDR support for Plasma 6 (Wayland). Dunno how ready it'll be by the time it comes out, but its coming.
Other than Plasma 6, I don't think so.
Release date should be around February and it already has a beta, so it's probably safe to go test in now.
I built a couple of HTPCs like 7 years ago or something. Kaby Lake iGPU had support for 4k HDR so I figured I would use the i3 7100T and Linux would add HDR support soon (I was using LibreELEC which was a minimal Linux that just boots into Kodi). Welp still waiting...