Playing PC games with Sony's DualSense controller is a piece of cake.
In most circumstances, there’s no reason to pair an external gamepad with a Steam Deck — after all, the handheld has its own controls, much like a Nintendo Switch. But there are certain situations ...
First of all, ensure the light bar on top of the controller isn’t on. If this is the case, hold down the PS button on the centre of the controller until it turns off. Head to Settings > Accessories > ...