I do not have a nintendo wii my next door nabor might allow me to try my controlers at his house.
I did acsidently plug the controlers in upside down. I didn't know the logo was supposed to go up.
I loaded eatc program that used the nunchucks and the controllers plugged in was detected. But the serial write of button or joystick status did not changed when I pressed c on some of the games on eather or bot controlers and the position did not change.These are knockoff controlers not official nintendo ones so maby that is someting.