This happened to me in a couple of games (Nioh being the latest): after playing the game with the deck docked (using an external monitor and controller), I can no longer play it on the deck itself because it seems the game no longer registers the deck's buttons.
Has anyone else experienced this?
Like ostsjoe said, you probably need to reorder your controllers and set the deck to be controller 1. You can do this in two places:
Open the QAM menu (the ". . ." button), open the gear tab, and there should be a "reorder controllers" button. This button only appears if additional controllers are connected, or if the Deck is currently set to a controller slot other than 1.
Press the steam button, and open the controller configuration menu for the game. At the top there should be a button to reorder the controllers.
Rarely I've also had where a game identified a controller in spot 2/etc as the one I was playing with, and the deck had to be set to that controller slot for the game to work until I relaunched the game.
Yesterday the deck got to a state where you can't even use the deck'a buttons at all. It is just stuck. We've been doing the reorder thing but this happened yesterday to us and we had to hard reboot.
I don't know what's going on but the dock experience got very bad these past few weeks. For example, VRR isn't working for us anymore.