

I have an Alienware AW3423DWF and use it with Fedora KDE.
No problems here. Some games don’t support ultrawide without mods but I haven’t encountered any of these mods that don’t work on Linux yet.
As for HDR, it should be ready for primetime once Proton 10 comes out with Wayland support. As of right now, you have to either run your game through gamescope or use Wine/Proton with Wayland support enabled, e.g. Proton-Tkg (Wine master).
It’s a really good monitor by the way, still impresses me with its pure black on a regular basis, even in SDR.
You are missing the Muse for your Poet. :D
https://www.youtube.com/watch?v=GLxb7m0j5Jg