Game not launching under Linux

[Father]

I can play other games just fine on LInux with Proton but Dave the Diver is not launching. The Launch Dialog of Steam appears and it says "Running" for a few seconds but then it cycles back to not running and no window of Dave the Diver is ever opened. I have a RTX 2070 so the hardware requirements are fulfilled and other graphically demanding games work fine on Steam/Linux. I successfully verified the integrity of the game files in steam.

Is there a trick to make it launch?

[DMNinja]

Are you running it under wayland by any chance? I personally run it with the `SDL_VIDEODRIVER=x11 %command%` flag, among others (gamemode and gamescope more specifically

EDIT: To further elaborate, these are my flags
SDL_VIDEODRIVER=x11 gamescope -h 720 -H 1080 -e -f -F fsr -- gamemoderun %command%

You need to have both gamescope and gamemode installed though. I'm also using FSR, which you don't need to do, but it's a blanket preference for me

In that case, the flag would be:
SDL_VIDEODRIVER=x11 gamescope -e -f -- gamemoderun %command%

[DMNinja]

-e is for steam integration and -f is for fullscreen

[Father]

Thank you for your detailed response! I just checked to make sure that i'm running X11 and i do. I am running plasma and printenv shows XDG_SESSION_TYPE=x11.

I just googled gamemode and gamescope and if i understand it correctly, then they are only beneficial under wayland, right?