Valve has rolled out a new Proton Hotfix update that restores compatibility for ARC Raiders on Linux and SteamOS, following widespread issues caused by a recent anti-cheat rollout. The fix arrives shortly after players reported that the game had become unplayable on Linux systems due to changes tied to Denuvo Anti-Cheat.
With the update now set as the default compatibility layer for the game, most users can jump back in without needing manual tweaks or workarounds.
Anti-Cheat Update Initially Broke Linux Support
The issue began when ARC Raiders started transitioning from Easy Anti-Cheat (EAC) to Denuvo Anti-Cheat. This change was introduced gradually, meaning some players were affected while others continued using the previous system.
However, for many Linux and SteamOS users, the new anti-cheat implementation caused the game to stop working entirely. Since anti-cheat systems often rely on deep system-level integration, compatibility with Proton—the layer that allows Windows games to run on Linux—can be disrupted.
This created a significant problem for players using platforms like the Steam Deck, where Proton compatibility is essential.
Valve quickly addressed the issue by updating its Proton Hotfix branch, a special version of Proton designed to deliver urgent fixes for specific titles. The company initially made adjustments through the Proton Experimental beta, but that solution required users to manually opt in.
The latest update improves the process by making Proton Hotfix the default for ARC Raiders. This means players no longer need to switch compatibility settings manually—ensuring a smoother and more accessible fix.
As a result, most users can now launch and play the game on Linux or SteamOS simply by keeping their system up to date.
Why Proton Hotfix Matters for Steam Deck Users
For Steam Deck owners and Linux gamers, Proton is a critical tool that bridges the gap between Windows-based games and alternative operating systems. However, anti-cheat compatibility remains one of the biggest challenges in this ecosystem.
The quick rollout of a Proton Hotfix highlights Valve’s ongoing commitment to maintaining compatibility for popular titles. By responding rapidly, the company helps prevent long-term disruptions that could discourage players from using Linux-based platforms.
At the same time, the situation underscores how fragile compatibility can be when external systems like anti-cheat software are involved.
Despite the successful fix, the incident serves as another reminder of the ongoing challenges facing Linux gaming. Anti-cheat systems, particularly those designed for competitive or online-focused games, often struggle to integrate smoothly with Proton.
Even as more developers embrace cross-platform releases, ensuring consistent functionality across operating systems remains a complex task. Changes to security systems can unintentionally break compatibility, requiring rapid intervention from both developers and platform providers.
