Forza Horizon 6 Fixes Arrive in June 2026 Proton Experimental Update

Valve has released a new update for Proton Experimental, providing critical fixes for Forza Horizon 6, Forza Motorsport, and several other titles to improve compatibility on Linux and SteamOS. This update, which arrived on June 1, 2026, addresses specific stability concerns that have impacted players on the PC platform, particularly regarding system suspend and resume functionality.

Understanding the Latest Proton Experimental June 2026 Update Patch Notes

Proton Experimental serves as the primary testing environment for Valve’s compatibility layer, which allows Windows-based games to run on Linux-based operating systems like SteamOS. By acting as a precursor to stable numbered releases—such as the upcoming Proton 11 currently in beta—this branch allows developers to iterate on fixes rapidly. For users looking to maintain a stable gaming library, understanding what is included in the latest Proton Experimental update is essential for troubleshooting common software conflicts.

The June 1, 2026, release introduces support for two additional titles that are now verified as playable: Warhammer: Dark Omen and Portal Worlds. These additions expand the library of titles accessible to Linux users, continuing Valve’s commitment to growing the Steam Deck and desktop Linux ecosystem.

How to Fix Forza Horizon 6 Suspend Issues on Linux

One of the most significant changes in this patch directly targets the performance of Forza Horizon 6. Previously, PC players reported that the game would unexpectedly close when the system entered a suspend state or resumed from one. This instability often interrupted long play sessions or forced users to restart the application entirely.

To implement this fix, users should follow these steps:

1. Open the Steam client on your Linux or SteamOS machine.
2. Navigate to your Library and search for "Proton" to locate the Proton Experimental entry.
3. If an update is available, Steam will automatically download and apply the patch to your local files.
4. Once the download completes, restart Forza Horizon 6 to verify that the suspend/resume functionality is operating as intended.

This update is part of a broader effort to ensure that high-fidelity titles, which often feature complex car list requirements and data-heavy assets, remain stable during power-state transitions. For those seeking a deeper walkthrough on managing Proton versions, our coverage at In Game News recommends checking the GamingOnLinux guide for detailed instructions on switching between stable and experimental branches.

Valve Proton Experimental Latest Bug Fixes 2026

Beyond the primary fixes for Forza Horizon 6, this update addresses a series of regressions and audio-visual bugs that have persisted in older titles. Valve has been working to resolve issues stemming from previous Proton 11 development builds, which inadvertently caused problems for legacy software.

Specific bug fixes included in this release are as follows:

• Homeworld 2 Classic: Resolved issues within the Homeworld Remastered Collection where the game would not behave correctly when using the alt+tab command.
• SHOGUN: Total War: Fixed a persistent bug that resulted in a black screen when players attempted to alt+tab out of the game.
• Hyperdevotion Noire: Goddess Black Heart: Corrected an issue where save files were failing to load or save correctly.
• Warhammer 40,000: Dakka Squadron - Flyboyz Edition: Fixed audio distortion occurring during the introductory video sequence.

These fixes demonstrate the ongoing maintenance required to support a vast catalog of games on non-Windows platforms. By addressing these specific bugs, Valve ensures that the user experience remains consistent regardless of the age or technical architecture of the title being played.

Managing Proton Versions for Optimal Play

It is important for users to note that Proton Experimental is distinct from the standard, stable Proton releases. While it offers the latest fixes, it is designed for testing purposes. Players who encounter issues with a specific game, such as Forza Motorsport or other racing titles, can manually switch their Proton version within the Steam settings for that specific game. Right-click the game title, select Properties, navigate to the Compatibility tab, and choose your preferred version of Proton from the dropdown menu.

As we continue our coverage of the platform, it is worth noting that Valve has been aggressive with its update schedule. A significant update was previously deployed in late March 2026, which included a wide array of performance improvements. Furthermore, the ongoing development of Proton 11, which recently reached Beta 5, suggests that the foundation for these experimental fixes will eventually be rolled into the main stable branch for all users.

Frequently Asked Questions

How to fix Forza Horizon 6 suspend issues on Linux?

To resolve Forza Horizon 6 closing after system suspend or resume, users must update to the latest version of Proton Experimental via the Steam client.

Does Proton Experimental support Homeworld 2 Classic?

Yes, the June 1, 2026 update for Proton Experimental includes specific fixes for Homeworld 2 Classic, ensuring the game behaves correctly when using alt+tab.

What is included in the latest Proton Experimental update?

The June 1, 2026 update adds support for Warhammer: Dark Omen and Portal Worlds, while fixing bugs in Hyperdevotion Noire, Dakka Squadron, Forza Horizon 6, Homeworld 2, and SHOGUN: Total War.