The steamdeck is a Linux device, if Godot can detect and use a controller on Linux (it can), then the same thing will be true on the steamdeck because it’s just a Linux machine.
Wow, this thread is so good to read. Thanks guys, sincerely. (I just managed to get Godot 4.7.1 working on my Chromebook Spin 514, retiring my old Windoze machine). Sounds like a Harrier jumpjet taking off just switching it on, and takes like 20 minutes to settle down anyway, so…