I understand, just to be clear this issue applies to all games using FSR4 on Proton Experimental, not just FF7 that was meant as an example. If it is better under a different issue that is fine I wasn't sure how to best report it.

I just tried Spiderman 2 with Proton Experimental and even that is running FSR 3.1 instead of FSR4. This is not game specific as @Hupro mentioned. Only way for now to enable FSR4 is either optiscaler or use proton-ge/cachyos.

I see exactly the same problem as well for the RDNA4 (9070XT).

Official Valve Proton, be it the Experimental (default) or Bleeding Edge does not enable properly FSR4 or does not upgrade properly FSR3.1 to FSR4 at all. I tested a lot of games, and none of them is running FSR4.

Example some:

• Crimson desert
• KCD2
• Titan Quest 2
• Manor Lords

In order for us RDNA4 users to get FSR4 we have to force it via OptiScaler or use custom protons with the PROTON_FSR4_UPGRADE launch command or set it as environment variable.

Hi all. just popping in to give my confirmation of this happening on Proton Experimental with my RX 9070 GRE; I confirmed it via Helldivers 2, one of the few games that identifies which ver of FSR is enabled, and it sure as heck says FSR3 by default despite my card being RDNA4

Hi again all. Just popping in again to add something curious-
I upgraded to my 9070GRE from an RX 7600, which I still have.
When I re-install the 7600 in my rig, as I expected, Proton Experimental defaults to FSR4 just fine.
So it defaults to FSR4 on RDNA3 with that new feature, but the RDNA4 detection seems buggy?

A current workaround I have found is to use Proton-CachyOS. this enables it just fine automatically on my RDNA4 card :)

This is related to this change:

• amdxc64: Auto-enable upgrade on compatible HW.

Since recently, Proton Experimental started bundling contrib/amdxcffx64.dll, which is FSR 4.1.1 (~62.6Mb). This DLL asks the graphics driver to report whether the hardware is compatible before it runs. Proton serves as a driver and reports only RDNA 3 GPUs as supported. There is no way to make FSR 4.1.1 run on RDNA4 using non-modified Proton Experimental.

I don't see any technical reason not to add RDNA 4 GPUs to the allowlist, since they're officially supported by AMD.

However, there is a workaround, modify it by downgrading the DLL. You can manually replace:

~/.steam/steam/steamapps/common/Proton - Experimental/contrib/amdxcffx64.dll

with the FSR 4.1.0 (~48.7Mb) and set FSR4_UPGRADE=1 launch option. Or use custom Proton, OptiScaler, etc

I don't see any technical reason not to add RDNA 4 GPUs to the allowlist, since they're officially supported by AMD.

The DLL from contrib/ does not enable FSR4 on RDNA4 with the current state of Proton. It will claim in the options that FSR 4.0.1 is used, as that the version advertised by the DLL itself, but it will render using the FSR3 model.

The reason why we limit it to RDNA3 via the linked commit is to avoid that exact confusion. People would see FSR4 in setting but would get FSR3 anyway.

Any idea how to go about fixing that? I'm a total newbie but would love to attempt it on my local machine at the very least