Is the steam controller registering as a joystick and a mouse? It could be amazing to manage my current media center! As I cannot make KDE detect my current controller as a mouse
Although on Linux side. As far as i remembered, it's up to how kernel driver developer to map the device input into different class. It would be up to valve to decide what to do in this case.
The original steam controller’s LT and RT work as mouse buttons in mouse mode, too. Source: have 3 steam controllers