HedgeModManager + “Generations Fixer” mod disables the config mismatch check and adds ultrawide/FPS fixes.
A: Uninstall Sonic Generations , delete the SEGA folder in Documents and the 71340 folder in Steam’s compatdata (if Steam Deck/Linux) and reinstall fresh.
: In the configuration tool, re-select your Graphics Adapter and Resolution . Click Save and Exit . Advanced Troubleshooting Methods
The Sonic Generations modding community has solved this error permanently. The or "HedgeModManager" tool completely rewrites the detection logic.
The most effective solution is to force the game to reset its hardware detection:
Try changing the graphics settings within the game: