@pengu1n said in GPIO Controls Not Registering After Launching Games: [WARN] Input device ID 3 is unknown to this libretro implementation. Using RETRO _DEVICE_JOYPAD. That's because of the RA's configuration - try resetting the configuration to default by copying the retroarch.cfg.rp-dist files over the retroarch.cfg in the /opt/retropie/configs/all/ folder.