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Valve stealthily put out a Release Candidate for testing the next stable update to Proton for Linux PCs and Steam Deck with Proton 9.0-2. They actually put this up last week on May 24th.

Posted up on the official Proton GitHub, Proton 9.0-2 Release Candidate includes various changes previously in Proton Hotfix and Proton Experimental. Valve are looking for feedback on any issues that happen that were not present in Proton 9.0-1.

Here's the current changes:

  • Now playable:
    • Alpha League
    • Battlezone Gold Edition in VR mode
    • Black Desert Online
    • FreestyleFootball R
    • Helldivers 2
    • Hero's Land
    • Iragon
    • Senua's Saga: Hellblade II
    • SimCity 3000 Unlimited
    • Warlords Battlecry III
  • Enabled controller support via Xalia in the launchers of:
    • Clustertruck
    • Fallout 3 (standard and GOTY edition) - partial support only
    • Fallout 4
    • Mugsters
    • The Elder Scrolls V: Skyrim (72850)
    • The Elder Scrolls V: Skyrim Special Edition
    • Tomb Raider: Anniversary
    • Tomb Raider: Legend
  • Limited number of cores seen by the following games making them playable on a high core count CPUs:
    • Call of Juarez: Gunslinger
    • Command & Conquer and The Covert Operations
  • Fixed Ghost of Tsushima and Horizon Forbidden West displaying a warning about outdated drivers with Nvidia GPUs.
  • Fixed The Finals crashing on launch after a recent game update.
  • Fixed The Finals wrongly detecting button mashing.
  • Fixed The Finals not working on machines supporting AVX512 without clearcpuid=304 in the kernel command line.
  • Fixed Apex Legends not starting after a recent game update.
  • Fixed Tekken 8 reporting wrong connection type if both WiFi and Ethernet are present.
  • Fixed Ubisoft Launcher not starting games with a fresh Proton prefix.
  • Fixed Halo Infinite crashing randomly during "initializing data".
  • Fixed Beat Saber not being playable on Nvidia GPUs without using the legacy branch.
  • Fixed Marvel vs Capcom: Infinite crashing when creating multiplayer lobby.
  • Fixed hosting multiplayer games in Foundry.
  • Fix rendering of Japanese characters in the launcher of Granado Espada Japan.
  • Fixed Nightingale not being able to authenticate with Steam on desktop.
  • Fixed Bloons Monkey City thinking it's offline with IPv6 support disabled.
  • Fixed Ubisoft Launcher asking for serial number on the first launch of Tom Clancy's Ghost Recon: Future Soldier.
  • Fixed Descent 3 not working in GL mode.
  • Fixed Shatterline freezing on loading screen when trying to join a second online match in a session.
  • Fixed Age of Empires II: Definitive Edition crashing when skipping intro videos.
  • Fixed Imperiums: Greek Wars launcher.
  • Fixed Call of Juarez: Bound in Blood failing to launch on a fresh prefix.
  • Fixed audio stutter in Viking: Battle for Asgard.
  • Fixed Swords of Legends Online launcher not being displayed correctly.
  • Fixed Russian language rendering in Brothers: A Tale of Two Sons launcher.
  • Fixed scaling in The Desolate Hope when playing on desktop.
  • Improved controller input support for Tower Princess.
  • Improved performance in We Love Katamari REROLL+ Royal Reverie.
  • Fixed GRIS showing error window when exiting the game.
  • Fixed issues with transparency in Akka Arrh.
  • Fixed load / save dialogs not working in Idle Spiral on Steam Deck.
  • Added raw HID support for VKB Gunfighter SCG.
  • Fixed random crashes in Cosmoteer Starship Architect & Commander.
  • Fixed font rendering in Cosmoteer Starship Architect & Commander on Steam Deck.
  • Improved Chinese font rendering in Cosmoteer Starship Architect & Commander.
  • Fixed Russian and Hebrew font rendering in Simon the Sorcerer: 25th Anniversary Edition.
  • Improved font rendering in Alien Swarm: Reactive Drop on Steam Deck.
  • Updated support for OpenXR to version 1.1.36.
  • Updated OpenVR support to v2.2.3.
  • Updated vkd3d-proton to v2.12-58-gf6d39052afb1.
  • Updated dxvk to v2.3.1-64-g889802887fa5.
  • Updated dxvk-nvapi to v0.7.0-7-gaae4902b6ff7.
  • Updated Wine Mono to version 9.1.0.

Pictured - Black Desert

Currently the post on GitHub has no replies, so I imagine most people missed the Release Candidate as well. So now you've got a weekend of testing ahead of you.

How to test?

Look for Proton 9.0 in your Steam Library, go into the Properties -> Betas and select release-candidate from the drop-down box.

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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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fschaupp May 31
Nice to see VR updates for Linux! Didn't expect that to become a (realistic) thing in 2024!
QuoteEnabled controller support via Xalia in the launchers (..)
Interesting project I have not heard of before:
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