SteamOS Adds HDMI 2.1 and CEC for Steam Machine Launch
Valve quietly enabled HDMI 2.1, TV-remote control, and Steam Controller grip-sense in one SteamOS update — the runway lights for the Steam Machine just turned on.
The May 19 SteamOS update is being read as a controller-firmware patch, but the real story is HDMI 2.1 — Valve has finally enabled it after a long-running licensing snag, unlocking 4K high-refresh and VRR over a single cable on every SteamOS device, including docked Steam Decks. The same update adds HDMI-CEC so you can drive the Steam Machine from a TV remote, customizable LED bar lighting, new grip-sense calibration for the $99.99 Steam Controller that shipped May 4, and overdue SD card mount management. Read together, this is a textbook pre-launch hardening pass: living-room display compatibility, couch input ergonomics, and storage hygiene all cleared off the punch list in one drop. Anyone who's tried to plug a Deck into a 4K TV and lost VRR has been waiting on this update for two years. The Steam Machine still has no firm release date, but Valve doesn't ship CEC support and HDMI 2.1 in the same week unless something is about to be plugged into something.