This issue can be closed.
I'm finally able to get it working on my Steam Deck :
PROTON_LOG=1 logs.
Persona 5 Royal using Proton: 1731350438 proton-8.0-5d:
https://gist.github.com/EpicureanGit/e9074ca5c4735ab0a034122fe4e70225
Persona 5 Royal using Proton: 1731348819 proton-7.0-6f:
https://gist.github.com/EpicureanGit/cc8606d66863291024e3696beef99407
Symptoms:
The menu and game runs at ~25-30 FPS using Proton-8.0-5 and Proton Experimental. I didn't try Proton 9.0-4. It runs at ~60 FPS using Proton 7.0-6 using the same configuration.
Reproduction: Start the game and reach the main menu.
proton 9.0-4x2 2025-05proton 7.0-6x1 2025-05proton 7.0-6fx1 2025-05proton 8.0-5x1 2025-05proton 8.0-5dx1 2025-05proton experimentalx1 2025-05ge-proton9-27x1 2025-04PROTON_LOG=1x1 2025-05
Compatibility Report
System Information (Steam Deck)
I confirm:
steam-1687950.log
Symptoms
On Steam Deck :
Also tried with Proton 9.0-4 and GE-Proton9-27 and after deleting compdata 1687950 folder
On Windows 11 with RTX 3060 Ti:
Game start and I can go to main menu
On Linux (Bazzite 42/Fedora 42) with RTX 3060 Ti:
Game start and I can go to main menu
Reproduction
Install the game, delete compdata folder 1687950 if it exist, try to start the game.