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Proton Experimental is the extra special testing area where new fixes and features enter the Steam Play Proton compatibility layer before going out to everyone and there's a new update out. If you're not clear on what Proton and Steam Play are, be sure to check out our constantly updated dedicated page. It's a special compatibility layer for running Windows games and apps from Steam on Linux.

Proton Experimental as of the latest update (March 3, 2021) has these extras added into it:

- Fix Xbox controller input and hotplugging in Hades.
- More PlayStation 5 controller layout improvements.
- Fix crash in Home Behind 2, Crown Trick, and possibly other Unity-based titles.
- Improved Virtual Reality startup time, and better compatibility with more games including Microsoft Flight Simulator, Gravity Sketch, Battle Arena VR, Until You Fall, and more.

To use Proton Experimental in the Linux Steam client you need to ensure it's installed. If you search for it in your Steam Library, it will show up like other games and software does. Then on any game in your Steam Library, just right click and go to Properties and then select it from the drop-down menu in the Compatibility section:

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 came back to check 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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Julius Mar 3, 2021
Ah, nice. I was really waiting for a fix for Until you Fall :)
Xaero_Vincent Mar 4, 2021
Supposedly it also fixes a bug that was causing Ubisoft Connect to not remember saved login credentials.

Last edited by Xaero_Vincent on 4 March 2021 at 3:56 am UTC
Beamboom Mar 8, 2021
This one caused several VR games to not start for me - I had to revert to latest stable.
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