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Valve is slowly but surely improving the state of Linux gaming after its failed Steam Machines. The upcoming Steam Deck handheld runs on Linux, and its compatibility layer allows it to play Windows games as well. Valve has added support for the machine learning temporal upscaling technique to the game, which could bring big increases in the number of players and the quality of the game.
According to Tom's Hardware, the first stable release to include support for DLSS is Proton 6.3-8, though it appears you'll still need to set PROtonenABLENVAPI=1 and dx. The Steam Deck will support the less capable FSR, even though it requires proprietary Nvidia machine learning Silicon.
Deathloop, Age of Empires 4, and Mass Effect Legendary Edition are just a few of the Windows games that can be supported by the new version of Proton.
The release includes support for an initial set of BattlEye games, which may or may not be holding back some of the most popular Steam games from having proper working multiplayer on the Steam Deck and Linux. Ball is in the developers court.
The full changelog can be found here. In June, it was announced that Valve would work with Nvidia to bring the software to Linux.