First of all, I updated my Fedora 42 to the latest release, as well as the AMD-GPU and MESA (Vulkan) drivers.

I updated Fedora 42 to the latest release and installed Steam, ProtonUp-Qt, and ProtonTricks — all from Flathub (Flatpak). To install ProtonTricks, use the command: flatpak install flathub com.github.Matoking.protontricks.

In ProtonUp-Qt, I downloaded GE-Proton9-2.

I applied the permission fixes for ProtonTricks using: flatpak override --user --filesystem=~/.var/app/com.valvesoftware.Steam com.github.Matoking.protontricks.

I launched Steam from the terminal (no need to use sudo) with: flatpak run com.valvesoftware.Steam.

In the game's compatibility settings, I selected GE-Proton9-2.

I opened Assetto Corsa through Steam and waited about 5 minutes for Proton to complete the setup.

In case of issues, it’s recommended to close Steam and delete the game’s Proton prefix by running: rm -rf ~/.var/app/com.valvesoftware.Steam/.steam/steam/steamapps/compatdata/244210.

After that, verify the integrity of the game files through the Steam interface and try running the game again.

I also used a Logitech G27 steering wheel with Force Feedback. To make it work, I used the lg4ff driver and the Oversteer software. It worked fine.