Valve appears to be preparing to bring AMD's FSR 4 upscaling technology to the Steam Deck. According to a report from GamingOnLinux on June 24, 2026, Valve has added a custom FSR 4 DLL to Steam and the Proton Experimental compatibility layer. This move could allow games that already support FSR 3 to utilize the newer upscaling path on the handheld device.
The addition was spotted by developers and enthusiasts analyzing recent updates to Proton Experimental. The custom DLL is designed to work with the Steam Deck's AMD APU, potentially improving performance and image quality in supported titles. FSR 4, announced by AMD in early 2026, offers enhanced temporal upscaling compared to its predecessor.
Valve has not officially commented on the integration, but the inclusion in Proton Experimental suggests testing is underway. The Steam Deck currently supports FSR 2 and FSR 3 via Proton, and FSR 4 could provide a significant boost for demanding games. However, the feature may require game-specific updates or patches to function properly.
This development aligns with Valve's ongoing efforts to optimize the Steam Deck experience. If successful, FSR 4 could become available to Steam Deck users through a future stable Proton release, though no timeline has been provided.
