Valve releases stable SteamOS 3.5.5 update for both Steam Deck models, bringing VRR and HDR support, screen customization options, and a new feature allowing the Steam Deck Dock to support VRR external monitors. The update includes improvements to graphics driver performance for Starfield and enhanced sleep resume speed, Bluetooth connection stability, and KDE Plasma changes. Users can now customize the MangoHud performance overlay to display FPS, wattage, and battery life remaining. #steamdeck #steamdock #gaming