As has been widely reported, with update 4.0 of the Switch OS, Gamecube controllers can now be used to play games on the Switch when connected to the Switch dock with a Nintendo first-party Wii U Gamecube adapter.
However, when I connect my Gamecube controller to my Switch dock via a Wii U adapter (all genuine Nintendo parts), the controller is not recognized by the Switch -- the only controller it shows as being connected are the pair of Joy-Cons.
My Switch is in its dock and it is (successfully) connected to a TV.
I have the Wii U Gamecube controller adapter connected to the Switch dock by plugging both USB-A cables from the adapter into the two USB-A ports on the outside of the Switch dock.
Things I've tried:
- Verifying that my Switch does have the version 4.0 OS update.
- Manually having the Switch detect new controllers by going to the "Change Grip/Order" screen and then pressing and/or holding the L and R buttons on the connected Gamecube controller. (Nothing happens.)
- Test the Wii U adapter and Gamecube controller with Smash Bros. for Wii U to verify they still work ok.
- Reboot the Switch. (Actually rebooting, not just putting it to sleep and waking it.)
- Unplug and replug the USB cables from the adapter into the Switch.
- Swap the order of the two USB cables from the adapter.
- Try different ports on the 4-port Wii U Gamecube adapter.
- Try using a different Gamecube controller.
Why isn't this working? How can I make my Switch recognize my Gamecube controller connected via a Wii U Gamecube controller adapter?