I’m guessing I have to add my user to a group so they can access the controllers but my googlefoo is failing me.
I’m not a gamer but i think you have to add your user to the input group? Maybe it explains it here.
It was buried in that page for getting a PS3 controller working:
Make sure your user is in the “input” group:
usermod -aG input yourusername`
Reboot your system. Steam should now detect your PlayStation 3 controller.