I’ve added to the Steam package repository for Fedora an alternative kernel module for
xpad, the X-Box gamepad driver. This variant contains patches created by Valve to improve the driver and its behaviour.
The module is available in both akmod (RPMFusion) and dkms package formats.
This made my 3rd party X-Box controller work without any issue in Steam games and in the Big Picture Mode interface!
I’ve added a note on Valve’s wiki and Steam forums regarding it, for installation and instructions just head to to the Steam repository page.