Works:

Pinball FX

Crysis Remastered

Horizon Zero Dawn

Spiderman

Cyberpunk 2077

Ori and the will of the whisps

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Doesn’t work:

Control (thought this one was supposed to work?)

Pinball Arcade

NFS Unbound

Redout

Nex Machina

Hot Wheels Unleashed

Black Widow Recharged

Gravel

Star Wars: Squadrons

Inside

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Grip, haven’t gotten it to work yet myself, look here: https://steamcommunity.com/app/396900/discussions/0/1652169858536175563/#c1644295067080498033

Mentioned files are here:

home/deck/.local/share/system/Steam/steamapps/compatdata/396900/pfx/drive_c/users/steamuser/AppData/Local/Grip/Saved/Config/WindowsNoEditor/

These are Unreal Engine settings, so it might work for other Unreal-based games, or you could borrow well working settings from other Unreal games.

Mentioned settings might not be perfect for the Deck, I don’t know if the exact HDR standards the Deck is using can be found anywhere yet.