On October 23, Valve released SteamOS 3.9.5 to the stable channel for all users. The update is the first stable SteamOS release since 3.8 and covers changes across Steam Deck, Steam Machine, Steam Frame, and third-party handhelds like the Legion Go 2. According to Valve’s announcement, the release includes an Arch Linux base update, a Plasma Desktop Mode jump from 6.4.3 to 6.7.3, a WiFi backend change, a Linux 7.2 kernel rebase, an idle power consumption improvement on Steam Deck when no audio is playing, and preliminary hibernation support.
General fixes touch display, audio, and desktop mode
Beyond the larger platform changes, the general changelog includes a series of smaller corrections. Valve fixed the Disable Frame Limiter toggle when VRR is enabled and repaired frame limits that caused lower than intended FPS on certain external displays. Audio issues on hotplug of certain monitors in multi-monitor setups were fixed, and a bug that could prevent switching to Desktop Mode after changing the timezone no longer requires a reboot. The update also fixed a problem where firmware updates could occasionally fail to apply on Steam Machine, plus a loss of input if a launcher window was accidentally dragged around in Game Mode. Valve also worked around a firmware issue on some ASUS devices that caused excessive fan speed upon waking from sleep.
WiFi backend switch prioritizes router compatibility
Valve switched the WiFi backend to wpa_supplicant by default and enhanced it with fast reconnect on resume from sleep, a feature previously limited to the iwd backend. wpa_supplicant is the older and more broadly deployed Linux wireless daemon, so making it the default prioritizes compatibility across the long tail of routers, access points, and hidden networks over iwd’s newer design. Hidden WiFi networks should see fewer first-attempt connection failures, and reconnects after the device wakes from sleep are quicker.
Hibernation is staged but not exposed
Valve added preliminary support for hibernation in the kernel, but the SteamOS 3.9.5 notes state that hibernation is not yet exposed in Game Mode UI. On Steam Deck, hibernation remains disabled because of an outstanding driver bug. The release also enhanced Linux kernel hibernation support to enable interrupting hibernate requests and fixed various driver issues, but the Steam Deck-specific bug remains the blocker. Valve typically lands kernel and driver groundwork before exposing a user-facing toggle, and the Steam Deck driver bug keeps the feature behind that line. For now, players will see no change to the existing suspend and resume workflow. The notes do not give a date for when hibernation might appear in Game Mode.
Linux 7.2 rebase turns scattered bugs into a single update
The Linux kernel rebase to version 7.2 is the enabling change behind several per-game and per-device fixes in this release. Games like ELDEN RING and DARK SOULS III were failing to run on recent Panther Lake Intel CPUs, and systems with RDNA1 or RDNA2 dedicated GPUs had suspend and resume problems. A kernel rebase updates core subsystems that games and drivers depend on, so the visible result is a long list of fixes across different titles and hardware. One SteamOS update therefore resolves scattered compatibility problems across Steam Deck, Steam Machine, and third-party handhelds. Changes at this layer also affect Steam Deck performance on Linux, since the kernel controls power management, graphics scheduling, and suspend behavior.
SteamOS now ships as a multi-device operating system
The 3.9.5 notes name Steam Deck, Steam Machine, Steam Frame, and Legion Go 2 in the same changelog. That scope explains why a single point release touches wireless behavior, display frame limiting, VR streaming, and third-party handheld brightness control. Valve fixed Steam Remote Play on Steam Machine when booting with no external display connected and corrected a frame limiter issue that affected VR titles streamed from Steam Machine to Steam Frame. Valve also improved support for the Steam Frame wireless adapter. On Legion Go 2, Valve fixed a system crash when launching Forza Horizon 6 and added preliminary brightness control. The update also fixed boot screen corruption on Intel PTL+ devices. STAR WARS: Galactic Racer no longer shows performance issues on resume from suspend on Steam Machine, and The Crew Motorfest had a potential GPU error resolved. This cross-device maintenance means SteamOS updates are no longer written only for Valve’s own handheld.
Developer-side changes include renames and VM guest support
The developer notes also list a set of lower-level updates. Various scripts and packages were renamed from steamos- to holo- with aliases to the former names where appropriate. Valve improved support for running SteamOS as a VM guest with accelerated graphics through virtio-gpu and venus, updated the included renderdoc version, and reintroduced support for Android binder IPC. The bootloader was updated to improve compatibility with certain motherboards. Desktop Mode’s lockscreen can now be explicitly enabled in settings, though it remains off by default, and RDP login with system users was fixed when enabled.
What Valve did not disclose
Valve did not disclose a percentage figure or a battery runtime estimate for the idle power consumption improvement on Steam Deck when no audio is playing. The notes do not provide a date for exposing hibernation in Game Mode UI, and they do not give a separate per-device rollout schedule. The release also includes security and stability updates and revoked compromised eMudhra CA certificates.
