HDR can be a hit-or-miss even on Windows though, thanks to the myriad combinations of monitors, cable versions and standards. So hard to give a definite answer besides "YMMV".
In my case though, it works fine without any hiccups. My main setup is a 7800XT, connected to an AOC CQ32G3SE using a DisplayPort 2.1 cable. HDR works fine both in Steam game mode as well as in desktop mode (KDE).
In my case though, it works fine without any hiccups. My main setup is a 7800XT, connected to an AOC CQ32G3SE using a DisplayPort 2.1 cable. HDR works fine both in Steam game mode as well as in desktop mode (KDE).