I have a laptop with an AMD 5900QH processor and a dedicated RTX 3070 Max -Q graphics card. Everything works fine but games not detected DLSS. The Nvidia card drivers are 495.44, kernel 5.15.2-2.
You need to force nvapi variable in your Proton startup command with the proper Proton version, and in the config file (I assume this is exactly what you are talking about, right? You Windows games under Proton in Steam?)
There is definitely something wrong with the Prime settings. After checking everything looks as it should, but DLSS doesn’t work anyway. In addition, I found a problem with a badly working external monitor connected via HDMI. Manjaro detects the connected device but does not let go of the signal. I didn’t change anything in the settings, no commands in the console except for checking. This is a clean system with no modifications.
If anyone knows where to report such problems, I will be grateful for the guidance.