Hey all,
So, with the latest MESA driver updates its now very easy to run FSR4 on FSR4 native games but as well to upgrade FSR3.1 games to FSR4. I did test this in KDC2 and even tough the game still says FSR3.1, the difference is night and day.
Currently in order to have a working upgrade from FSR3.1 to FSR4, considering you have the latest MESA 25.2 drivers, the only thing you need is to install the latest proton-cachyos. I tested as well Valves Proton Experimental (bleeding-edge) but looks like the necessary change is not there yet.
NOTE: Most likely this is due to the fact Experimental doesn’t automatically download the needed .dll, where proton-cachy does. In such case you need to copy over to the games prefix folder the .dll manually
So for those that want to use FSR4 ~ e.g upgrade their games from FSR3.1 to FSR4, without using optiscaler. Here is the step by step.
- Be on the latest MESA drivers at minimum
25.2 - Install latest
proton-cachyos - Set your game in steam to the latest
proton-cachyos - Set your game in steam Launch Option to
PROTON_FSR4_UPGRADE=1 %command%
Here are some pictures showing the difference between FSR3.1 and FSR4 using the procedure above. I hope Garuda mods forgive me that I am using full size picture quality.
FSR3.1
FSR3_birds_ghosting
FSR3_water_drops_not_rendered
FSR4_water_drops_rendered
- As you can see the overall picture quality is overall extremely improved.
- Small details like water droplets from the roof are now properly visible to to relative distance of the game character.
- Small details like birds, leafs, water and others doesn’t have ghosting
References:
If somebody found a way of running this on Proton Experimental share your steps!