Valve fixes Marvel Rivals on SteamOS and Linux with Proton hotfix

Valve has pushed a Proton hotfix that gets Marvel Rivals running properly again on SteamOS and Linux. The fix addresses compatibility issues that had been stopping the game from launching or running correctly through Steam Play.

The source is thin on specific version numbers or technical details beyond the hotfix landing, so the exact nature of the underlying breakage isn't confirmed. What is clear is that Valve moved quickly to patch Proton rather than waiting for a full scheduled release.

Marvel Rivals — NetEase's hero shooter that launched to strong player numbers — has no native Linux build, so Steam Deck and Linux players depend entirely on Proton for compatibility. Valve's willingness to ship targeted hotfixes for high-profile titles is part of its broader push to keep SteamOS viable as a gaming platform.

If you were hitting launch failures on Steam Deck or a Linux desktop, restarting Steam should pull the fix automatically.