Proton Experimental Adds FSR 4 Support for RDNA 3 GPUs on Linux

Following the recent release of FSR 4 support on RDNA 3 GPUs, Valve engineer, Pierre-Loup Griffais, has announced in a post on Bluesky that the same support has officially been added to Linux via Steam’s Proton compatibility layer. Support for FSR 4 on RDNA 3 comes by way of the latest version of Proton Experimental, so it’s by no means a stable implementation just yet, but the engineer specifically calls out SteamOS and the Steam Machine as the target system for the new upscaler support, suggesting that Valve will invest development resources into getting the support into a more complete state ahead of the full roll-out of the Steam Machine.