I have running on my Raspberry 3 RetroPie 4.0-rc1.
There are many nice tutorials to when it comes to install it and setup the roms even just a few cover the most important thing: the gamepads!
Each one of them has its own way to be installed or maybe it comes already with the compatible interface.
I am lucky and in my case, I have a generic 2 player pad that the Ultracabs USB interface gives me.
The problem is that being a 2 player device, just one gamepad is detected. So just one player gets configured.
What can I do in this case? What could be the cause?