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Another smaller but great sounding upgrade for Proton Experimental to run more Windows games smoothly on SteamOS / Linux is here.

It's been a really busy weekend for Valve it seems. We've had SteamOS 3.9.2 Beta for all devices, a Steam Client Beta update, and SteamOS 0.4.1 Beta for Steam Frame too.

What exactly is Proton Experimental? A brief reminder for you - Proton Experimental is a compatibility layer to run Windows games on Linux systems like Steam Machine, Steam Deck and Desktop Linux. This one is like their testing ground for future stable numbered version Proton update, the most recent being Proton 11.0-2.

You can install any version of Proton by just searching for "Proton" in your Steam Library. Check out the GamingOnLinux Guide to all the different Proton versions if you're confused.

Key Changes - 25th September
  • Fixed a Proton Experimental regression that made CEG-protected games unplayable.
  • Fixed Crysis and Crysis Wars not being playable with some newer AMD CPUs that support CPUID faulting.
  • Fixed rendering corruption in Return to Krondor.
  • Fixed Japanese text rendering in Killer7.
  • Fixed Hide and Moo! showing error when quitting the game.
  • Added early support for 32bit OpenXR (requires PROTON_USE_WOW64=1 on x86).

There was another update to Proton Experimental less than a week ago with even more improvements.

🌐 External Sources: GitHub - Proton
Article taken from GamingOnLinux.com.
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I am the owner of GamingOnLinux. After discovering Linux back in the days of Mandrake in 2003, I constantly checked on the progress of Linux until Ubuntu appeared on the scene and it helped me to really love it. You can reach me easily by emailing GamingOnLinux directly.
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1 comment
Lin-Ursin 26 Sep 2026
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I love GOL when it brings me good news. Avery time I see CEG referred news (be cursed all and that DRM in particular) I always try again Sniper Elite V2. Always to fail, again (cracks works but they create bugs ingame).

But this time, this time at last! it worked on Experimental. It's going to be a nice day.

Time to replay one of my favorites 🥳
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