Valve has released a new Proton Experimental update with fixes for several Windows games running on Linux and Steam Deck, including Command and Conquer titles, Forza Horizon 4, Far Cry 5 and Lords of the Fallen.
The August 7 update also addresses Steam authentication problems in Nightingale and rendering issues in SYDE Rugby League Simulator.
For Steam Deck owners already using Proton Experimental, the update should install automatically. It can also be downloaded manually through Steam.
Proton Experimental August 7 fixes
| Game | Fix |
|---|---|
| Far Cry 5 | Removes outdated AMD driver warning |
| Far Cry 5 | Fixes HDR problems |
| Nightingale | Fixes Steam authentication failure |
| SYDE Rugby League Simulator | Fixes garbled and flickering graphics |
| Lords of the Fallen | Playable again after Proton 11 regression |
| Forza Horizon 4 | Fixes memory leak on first launch under KDE Wayland |
| Command and Conquer games | Steam Workshop custom levels detected again |
Several of the changes specifically correct regressions introduced with Proton 11.
Command and Conquer Workshop support returns
One of the biggest fixes affects multiple Command and Conquer games.
Custom Steam Workshop levels should now be detected correctly again in several titles that were affected by Proton 11 regressions.
The supported list includes Command and Conquer: Generals, Command and Conquer: Renegade, Command and Conquer Generals Zero Hour, Command and Conquer Red Alert 3, Command and Conquer 3: Kane's Wrath and Command and Conquer 3: Tiberium Wars.
For players who use community created maps and scenarios, the change restores functionality that had previously stopped working.
Workshop content can be especially important for older PC games because community maps and modifications often extend their lifespan well beyond the original release.
Forza Horizon 4 memory leak is fixed
The update also addresses a memory leak affecting Forza Horizon 4.
The issue occurred during the first launch of the game on KDE Wayland and could cause memory usage to continue climbing.
That type of problem can lead to stuttering, instability or crashes as system memory becomes exhausted.
The new Proton Experimental build should prevent that behavior.
This fix is particularly relevant to Linux desktops and handheld systems using KDE, including configurations similar to SteamOS.
Lords of the Fallen works again
Lords of the Fallen is listed as playable again after a Proton 11 regression caused compatibility problems.
The update does not describe the technical cause in detail, but restoring playability means affected Linux and Steam Deck players should no longer need to rely on older Proton versions as a workaround.
Proton Experimental is often used to deliver these compatibility fixes before they move into a stable Proton release.
That makes it useful when a game suddenly stops working after a compatibility layer update.
Far Cry 5 gets two separate fixes
Far Cry 5 receives improvements for both graphics and system detection.
The game should no longer incorrectly display an outdated driver warning when running with AMD graphics.
HDR support has also been fixed.
Incorrect driver warnings are usually harmless, but they can confuse players into thinking their system requires an update when the underlying driver is already suitable.
The HDR correction is more directly related to image quality and should help supported displays render the game correctly.
Nightingale and SYDE Rugby League Simulator also improve
Nightingale had been experiencing a Steam authentication failure under Proton.
The update fixes that issue, allowing the game to communicate correctly with Steam authentication services.
SYDE Rugby League Simulator receives a graphical correction for garbled and flickering rendering.
Rendering problems like these can make a game effectively unusable even when it technically launches, so the fix should provide a much more stable experience.
Proton continues improving Steam Deck compatibility
Proton remains central to Valve’s Linux gaming strategy.
The compatibility layer allows many Windows games to run on Linux without developers producing dedicated Linux versions.
Steam Deck relies heavily on Proton because most PC games are still developed primarily for Windows.
Experimental builds give Valve a way to distribute fixes quickly while testing them across a wider range of hardware and games.
The latest update is a relatively small release, but it addresses several meaningful compatibility problems. For Command and Conquer players, Workshop levels are functional again, while Forza Horizon 4, Lords of the Fallen, Far Cry 5, Nightingale and SYDE Rugby League Simulator all receive targeted fixes that should improve their behavior on Linux and Steam Deck.
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