Thankfully, some talented developers make it possible to play a selection of Xbox 360 games on the Steam Deck with Xenia. To reliably run Xenia on the Steam Deck, you must install the EmuDeck program.
So if you’re gaming on Linux or working on any other kind of retro gaming rig it’ll likely be plug-and-play ... Xbox controller to work indistinguishably from a stock Xbox 360 controller.