SteamOS: Unresponsive Steam Controller after recent Beta update
24 LISTOPADA 2016 O 6:28 - PIERRE-LOUP
If you have been experiencing issues with the Steam Controller after the 11/22 Steam client Beta update, please follow these steps to install the latest SteamOS hotfix:
If using the controller wirelessly, make sure to connect it to your SteamOS system using a micro-USB cable; if the controller was powered on, you might need to disconnect and reconnect the USB cable once to switch to wired operation
Sign in to your Steam account
Navigate to Settings -> System using the analog stick and press the "Check for SteamOS updates" button
Wait until the update icon stops spinning
Navigate back to the home screen with the B button
Find the SteamOS update message in the Inbox envelope, and apply the update
Problems can include total loss of input (if wireless) or inability to configure the controller (if wired). The update can also be installed with a keyboard or another type of controller.

Please note: Restarting your Steam Machine does not automatically apply update