Hello @bitshiftnetau, are you using xpadneo? This reads like https://github.com/atar-axis/xpadneo/issues/303.
No I'm not even using xpadneo as it doesn't support this controller. To be clear, it worked fine just before Christmas when using a Linux client to connect to a Windows machine over Remote Play. The timing may or may not be relevant, this may have always been broken on Linux who knows.
Ok I installed xpadneo and it's now fixed. I really hate technology. I hate it so so much...
Nothing extracted yet.
Your system information
Steam client version (build number or date):

Distribution (e.g. Ubuntu): Arch Linux
Opted into Steam client beta?: [Yes/No] no idea
Have you checked for system updates?: [Yes/No] Yes
Please describe your issue in as much detail as possible:
Describe what you expected should happen and what did happen. Please link any large code pastes as a Github Gist
Xbox One controllers don't work properly, for example right button is bringing up the start menu and the 3-stripe button doesn't work.
Steps for reproducing this issue: