Valve has released SteamOS 3.9.6 Beta, primarily aimed at testers, which addresses a framerate limiter issue that caused 30 FPS games to drop to 24 FPS on high-refresh displays. This update includes several bug fixes, such as resolving a green-screen Remote Play issue for Nvidia GPUs, black screens in RPG Maker games, and performance-tuning libraries breaking under gamescope. Additionally, the update improves frame pacing for Variable Refresh Rate (VRR) and corrects lagging issues on 240 Hz displays. While this is a maintenance release with no major new features, it enhances the overall performance and usability of SteamOS across various devices in the ecosystem

SteamOS 3.9.6 Beta Fixes Steam Deck's 30-to-24 FPS Limiter Quirk

Valve released SteamOS 3.9.6 Beta today, targeting testers on the Beta and Preview channels with its headline fix for a framerate limiter that silently dropped 30 FPS games down to 24 FPS on high-refresh displays. The maintenance build also patches a batch of real-world bugs, including a green-screen Remote Play issue on Nvidia GPUs, black screens in RPG Maker titles like Waste Walkers, and broken gamemode libraries under gamescope. In a minor slip, Valve's changelog still references the 3.8 stable baseline, though 3.9.5 is actually the latest stable release, which explains why a couple of fixes appear repackaged from an earlier build. 

SteamOS 3.9.6 Beta Fixes Steam Deck's 30-to-24 FPS Limiter Quirk @ Linux Compatible