I have a steamdeck, if that counts. My 8bitdo pro2 works perfectly. It registers as an xbox controller, so it's fine with every game. There's an upcoming update for steam that will recognize 8bitdo controllers as 8bitdo, too.

It's a Bluetooth controller, so it's remote plug and play. Super easy.

The pro2 i have has two backpedals. You can program them to be another button on the controller. I have them as l3 and r3, for example. But i set that up on my windows pc. It saved that setting across platforms. I've heard that's iffy to setup on Linux. But if you don't care about those pedals then its not a problem. Everything works out of the box.

Edit: actually the controller does show up in the Bluetooth menus in the Linux desktop. So it's safe to say it works even without steam.