@soda-inc said in How do I enable force feedback / rumble?:
Also, I found some old posts which indicated that the Retropie Kernel might not be setup for controller vibration support.
There's no RetroPie kernel and there's no special configuration that disables controller vibration support (as you've noticed with N64).
When starting a PS1 game, check if you have 'Enable Vibrarion' in the Core settings and also set the Pad 1 Type to Dualshock.