Official patch notes for Steam & Steam Deck from Valve, published on Steam on October 22, 2026.
This update is for the SteamOS Beta and Preview channels, and includes new features that are still being tested. You can opt into this in Settings > System > System Update Channel.
These notes contain all changes since the current stable SteamOS 3.8 release, with the changes added since the previous 3.9 preview releases noted below
New in SteamOS 3.9.4
General
- Fixed an issue causing firmware updates to occasionally fail to apply on Steam Machine
- Fixed a bug wherein changing the timezone could prevent switching to Desktop Mode until a reboot
- Fixed a regression from previous 3.9 releases that caused some apps to run behind Steam's loading screen, such as A Plague Tale: Innocence
- Fixed a regression from previous 3.9 releases that caused screenshots to be taken at 720p even when the display and game resolution are at a higher resolution
- Reduced incidence of audio clicks on 3.5mm output with sensitive earphones/speakers
- Security and stability updates
- Revokes certificates for certain CAs with insecure private keys such as "4"
Developer
- Improvements to hibernation support
- Temporarily disabled hibernation on Steam Deck devices due to some outstanding driver bugs
[*]Improvements for experimental dirlock disk encryption support
SteamOS 3.9
General
- Updated Arch Linux base
- Updated Desktop Mode from Plasma 6.4.3 to Plasma 6.7.3
- For more information, see (https://kde.org/announcements/plasma/6/6.7.0/) (https://kde.org/announcements/plasma/6/6.6.0/) (https://kde.org/announcements/plasma/6/6.5.0/)
[*]Improved support for Steam Frame wireless adapter
[*]Fixed a bug causing hidden WiFi networks to fail to connect on the first attempt
[*]Fixed Steam Remote Play not working on Steam Machine when booting with no external display connected
Read the full announcement on Steam
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Patch notes and news tracker by eSportCafe · source: Steam News