- Massive desktop upgrade to Plasma 6.7.3 and kernel upgrade to Linux 7.2.
- Optimization of standby power consumption and renewal of the Wi-Fi connection system.
- Expanded compatibility with external hardware such as Legion Go 2 and ASUS equipment.
- Preliminary implementation of hibernation, although it remains disabled on Steam Deck.
Valve has decided to make a bold move by releasing the stable version of SteamOS 3.9.5 , an update that, while the number might seem insignificant, is actually a profound change. We're no longer talking about a simple patch to fix a few things, but a complete overhaul of the system's foundations, affecting both the iconic Steam Deck and other devices joining the company's ecosystem.
The most striking aspect is that this version is the result of months of testing in beta and preview channels, condensing all the improvements accumulated since the 3.8 branch. For the average user, this translates into a smoother, more secure system that is compatible with modern hardware, moving towards a vision where SteamOS is no longer just the brain of a portable console, but a much more ambitious Linux gaming platform.
The desktop takes a quantum leap with KDE Plasma
If you often switch from gaming mode to use your console like a computer, you're in for a major surprise. The desktop environment has jumped from version 6.4.3 to 6.7.3 of KDE Plasma . Essentially, Valve has skipped three releases at once, integrating features the community has been clamoring for, such as managing multiple virtual desktops on screens —something that had been in development for over two decades.
In addition to organization, we now have support for HDR content and color management via ICC profiles, eliminating the need to choose between one or the other. As for performance, KDE boasts optimizations for CPU-intensive applications and a noticeable improvement in full-screen window rendering, especially if you're using integrated Intel graphics, making desktop navigation feel much smoother.
Technical foundations: Linux kernel and Arch Linux
Under the hood, the system has been rebuilt on an updated Arch Linux base and the Linux 7.2 kernel . Although newer kernel versions exist, Valve prefers to stay one step behind to ensure the system doesn't crash and that features like suspend and audio continue to function flawlessly. It's a prudent strategy: they prioritize absolute stability over cutting-edge technology.
Among the more curious internal changes is the reintroduction of support for Android binder IPCThis is a key tool for inter-process communication in Android, opening the door to exciting projects for developers. Furthermore, the naming convention for internal scripts has begun to change, moving away from prefixes... steamos- a holo-, a detail that suggests the system is maturing towards its own identity.
Battery, Wi-Fi, and the eternal wait for hibernation
For those who use the Steam Deck on the couch or on the train, there's an improvement that, while not easily photographed, is noticeable in your wallet: reduced power consumption when the device is idle and no audio is playing. It's not that games last longer, but standby power consumption has decreased, optimizing battery life during periods of inactivity.
Wireless connectivity has also been revamped. The system now uses wpa_supplicant as the default engine, which resolves those annoying issues where hidden Wi-Fi networks wouldn't connect on the first try. Furthermore, reconnecting from sleep is now much faster, preventing users from having to wait indefinitely to get back online.
As for hibernation, it's still a work in progress. Valve has added preliminary support to the code and improved disk suspend, but it remains disabled on Steam Deck due to an unresolved driver issue. For now, the feature exists, but you won't see the option in the game mode menus.
A system that looks beyond the Steam Deck
One thing this release makes clear is that SteamOS wants to expand its reach. The patch notes are full of references to third-party hardware. For example, the Legion Go 2 now has preliminary support for brightness control, and a critical crash when launching Forza Horizon 6 has been fixed. Similarly, some ASUS laptops will no longer suffer from the issue where the fans would run at full speed when waking from sleep mode.
VR enthusiasts and desktop PC users haven't been forgotten either. Frame limiter issues in VR titles streamed from a Steam Machine to a Steam Frame have been fixed . Furthermore, the new Intel Panther Lake processors can now run games like Elden Ring or Dark Souls III without system crashes or corrupted boot screens.
Safety and final touches
In terms of security, Valve has taken a drastic but necessary step: revoking eMudhra's certificates , as they were compromised. This is vital to prevent malicious websites from using fake keys and deceiving the system. While it might seem like a minor detail, it's one of the main reasons to install the update immediately.
Finally, the bootloader has been updated to support a wider range of motherboards, making it easier to install SteamOS in virtual machines with graphics accelerated by virtio-gpu and Venus. For desktop mode users, the lock screen can now be manually enabled, and annoying time zone-related bugs that required a system restart have been fixed.
This version 3.9.5 consolidates SteamOS as a robust platform that balances the modernity of KDE Plasma 6.7.3 and Linux 7.2 with aggressive compatibility for third-party hardware and smarter power management, paving the way for Valve's ecosystem to be accessible on any modern gaming device.
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