Your system information

• Steam client version (build number or date): 2020-12-28
• Distribution (e.g. Ubuntu): Arch Linux
• Opted into Steam client beta?: Yes
• Have you checked for system updates?: Yes
• Steam Logs: steam-logs.tar.gz
• GPU: AMD

Please describe your issue in as much detail as possible:

After Connecting via Steam Link, the controller input (in my case from a Steam Controller) is often not working in the remote Steam UI (but it works for controlling the Steam link).

Workaround is randomly toggling between mouse mode and controller mode (long pressing the back button, then selecting mouse mode and controller mode), switching the controller off and on again or stopping the stream and reconnecting.

Mouse mode works though.

Steps for reproducing this issue:

1. Start Steam
2. Connect to steam via Steam Link
3. Controller sometimes not working.