お知らせ&アップデート
2026年5月20日
SteamOS 3.8.5 Beta: Second Clutch
Note: This update is for the Steam Deck 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 3.7 release, with the new changes since the previous 3.8.4 Beta noted below
New in 3.8.5
Fixed a bug on Steam Deck OLED where rebooting would occasionally cause a loss of speaker output until rebooted again
Further improvements to video memory management on discrete GPU platforms
Fixed a bug in Desktop Mode causing previously open applications to not be remembered when using the 'Return to Gaming Mode' shortcut to logout
Fixed a regression from previous 3.8 builds causing controls to misbehave after resuming from suspend on the ASUS ROG Ally
Even more stability and security updates
General
Fixed a case where WiFi performance could become degraded until the device was put to sleep or manually reconnected
Fixed excessive trackpad sensitivity on certain early Steam Deck LCD models
Initial support for upcoming Steam Machine hardware
Added support for waking from sleep via connected Steam Controller
Updated Arch system base
Updated graphics driver with performance and stability fixes
Fixed a case where per-app performance settings would intermittently fail to apply when launching a game
Substantially improved speed of future OS updates on high-speed connections
Improved support for the screencasts in Game Mode (e.g. OBS/Discord)
Fixed dropdown menus not appearing in some games
Improved VRR frame pacing
Fixed FSR badge remaining off in the performance overlay, even if it was actually active
Improved support for games that attempt to open PDF files in external viewers
Added missing graphics features needed for titles such as "Crimson Desert"
Fixed an issue affecting certain titles (such as "SpongeBob SquarePants: Titans of the Tide") where the game window could have an incorrect position
Fixed closing certain titles (such as "STAR WARS Jedi: Survivor™") and Starfield resulting in a session crash
Improved support for certain USB racing wheels and USB devices that boot in a non-standard mode
Frequently these are devices that appear as USB storage devices with a driver installer, and must be switched to their normal mode by the OS
Steam Deck controller firmware updates now display update progress on the splash screen
Fixes issue on specific Steam Deck revisions where firmware updates could render the left controller inoperative for that session
Fixes for experimental nested desktop mode
Numerous stability and security updates
Bluetooth
Re-re-enable Bluetooth Wake for Steam Deck LCD
Fix for more spurious wake issues that were present in earlier attempts
Audio
Detect HDMI channel count and expose surround configuration if available
Add a setting to allow using Bluetooth headset mics (Bluetooth playback quality will be worse while capture is active)
Restore internal audio device on reboot if set to "Off" in desktop mode
Increase suspend timeout for HDMI devices so initial audio isn't cut off after a few seconds of inactivity
Fixed a bug with switching input devices when a wired headset is plugged in
Fixed an issue where audio underruns could be experienced after sleep/resume
Accessibility
Added an option to force mono audio output
Desktop Mode
KDE Plasma updated to version 6.4.3 from 6.2.5, and now uses wayland by default
Fixes several cases of reduced performance in Desktop Mode compared to Game Mode
Improved support for rotated displays
Better scale factor out of the box on TVs
Adds support for external HDR displays
Adds support for VRR displays
Adds support per-display scale factor
For more information, see Plasma release announcements
Keyboard layout and language are now obeying Game Mode settings
Improved windowing behavior for games running in Proton
System Firmware
Includes Steam Deck LCD BIOS v133
Security updates
Added "Memory Power Down" setup option
Preliminary support for hibernation
Includes Steam Deck OLED BIOS v114
Security updates
Charging LED now changes color when charge limit is reached, rather than only at 100%
Non-Deck
Improved compatibility with recent Intel and AMD platforms
Greatly improved video memory management on discrete GPU platforms
Fixed a compatibility issue with the SteamOS chainloader that could cause a boot failure on some desktop systems with recent UEFI firmware
Power button short and long presses now supported across a wide variety of devices
Improved controller support for OneXPlayer F1 series, GPD Win 5, GPD Win Mini, Anbernic Win600, OrangePi NEO, and Lenovo Legion Go
Added controller support for OneXPlayer X1 series and Lenovo Legion Go 2
Added system and controller firmware update support for the Lenovo Legion Go 2
Added preliminary charge limiting support for Legion Go, Legion Go S, and Legion Go 2 - currently only accessible in Desktop Mode
Added controller RGB LED color settings for the Lenovo Legion Go 2
Added controller, TDP control, and speaker audio support for the ASUS ROG Xbox Ally series
Reduced handheld controller input latency from 5-8ms to 100-500us
Night mode, color vibrance, and color temperature sliders in Steam now work on Z2E and later AMD APUs
Seamless boot fixes for Z2E and later AMD APUs
Automatically handle internally rotated display for some third-party handhelds
Improved motion control support for handhelds with BMI260 IMUs
SD card reliability improvements for some third-party handhelds, including ASUS ROG Xbox Ally, Legion Go 1, Legion Go S, Legion Go 2, and MSI Claw
Fixed washed out colors for Zotac and OneXPlayer handhelds with OLED
Fixed some GPU hangs on Phoenix APU devices (Tales of Arise, Octopath Traveler II)
Fixed ASUS ROG Ally power consumption from fingerprint reader while shut down
Fixed trackpad losing functionality after sleep/resume on the Legion Go
Fixed spurious wake-ups when using a Logitech Bolt receiver
Developer
Desktop Mode now uses Wayland by default
X11 support may still be selected via Steam developer settings, or via `steamosctl`
Updated Linux kernel to 6.16
Steam now uses steamos-manager to query available desktop sessions and trigger desktop session switching
Added support for setting the desktop password in developer settings
Initial support for running as a Virtual Machine guest (virtio guest drivers)
Added support for third-party devices to trigger the SteamOS boot menu via EFI variable
Added `custom-update` verb to `atomupd-manager` for easier testing of specific builds
System reports now include more audio debug information
Initial support for LAVD CPU scheduler via `steamosctl set-cpu-scheduler lavd`
2026年5月20日
SteamOS 3.7.25
SteamOS 3.7.25 has just been released for all users with the following changes:
General
Security and stability updates
2026年5月18日
Steam Deck Beta Client Update: May 18th
We have just shipped an updated Steam Deck Client to the Preview/Beta channel.
General
Fixed an issue where the Steam Workshop would download an older version of an item if there were multiple versions of the item that were marked valid for game beta branch the user opted into.
Fixed Steam html surfaces failing to render in some games (e.g. motd in Team Fortress 2).
Steam Input
Fixed FlyDigi Vader 5 Pro in enhanced mode
Steam Controller: Triggers and Grip Sense Activators now pulse the Rumble Haptics instead of Touchpad Haptics
Steam Controller: if Grip Sense is used with an Activator slot, or as one of the Gyro Enable Buttons, default Haptics Level to low. This is to help confirm activation in the absence of true physical response. To disable, set the Haptics setting to "Off" in Grip Sense activator settings, or if used as a Gyro Enable Button, set Haptics to "Off" in the Gyro mode settings.
Fix: "Reset Camera To Horizon" action was inconsistent in different engines - turn commands chunked into 2 to improve consistency.
Fix: Quick Settings Left Trackpad points to correct settings, instead of toward Gyro.
Steam Controller: Minor improvement to gyro micro stutter (ignore clone packets)
Gyro to Joystick Camera: Defaulted Gyro Deadzone Speed and Gyro Precision Speed to 0 to aide tuning the correct Minimum Joystick Output - these settings would swallow the micro movements needed to check the minimum response to gyro movements. Also: added Minimum Joystick Output slider on the Configurator Quick Settings list.
Fixed not being able to use Grip Sense to activate Touch Menus.
Steam Controller Firmware
Additional fixes for trackpad 'dead zone' issues experienced by some Steam Controllers.
Fixed IMU failures when using extended rumble.
2026年5月14日
Steam Deckベータクライアントアップデート:5月14日
アップデートされたSteam Deckクライアントをプレビュー/ベータチャネルでリリースしました。
全般
コントローラのファームウェアを更新中に、まれにSteam Controllerのウェルカムダイアログが表示されることがある問題を修正。
Remote Play
ローカル以外のストリーミング時に、クライアントが短時間で切断される問題を修正。
Steam入力:
以前のベータクライアントで発生していた、いくつかの小さなスタイリングのリグレッションを修正。
Steam Controllerファームウェア:
連続的なランブルによりジャイロの入力が途切れることがある問題を修正。
トラックパッドのタッチ設定を再調整。
2026年5月13日
Steam Deckベータクライアントアップデート:5月13日
アップデートされたSteam Deckクライアントをプレビュー/ベータチャネルでリリースしました。
全般
Steam Controllerに関連するクラッシュの問題を修正。
「Legacy Steam Runtime」互換性ツールが、Steamクライアントに含まれる代わりに、オプションの単体のダウンロードとして提供されるように変更。
ライブラリ
コントローラ使用時のEULAのスクロール動作を改善。
設定
デスクトップモード、Big Pictureモード、コントローラ設定におけるクライアント設定のレイアウトとスタイルを更新し、読みやすさと構成を改善。
メール、クライアント、モバイルの通知設定を1か所で変更できるように通知設定を更新。
特定の設定ページに直接移動すると(つまり、ヘッダーのネットワークアイコンをアクティブにすると)、設定ナビゲーションメニューではなく、そのセクションの最初の設定にフォーカスするように変更。
フレンド&チャット
デバイスのスリープ状態を解除したり、ネットワーク接続を切り替えたりした後、フレンドのステータスがより迅速に更新されるように変更。
Steam入力
互換性のない入力から複数の設定オプションを削除。 デジタルボタンは、アナログ入力を必要とする「押す」タイプを設定できなくなり、ジャイロは、互換性のないパイ型メニューやホットバーに設定できなくなりました。 これらのオプションは、互換性のあるすべての入力で引き続き使用可能です。
「ジャイロからジョイスティックカメラ」のタイミングの問題を修正。今後は、すべてのコントローラでよりスムーズに動作するはずです。
「ジャイロからジョイスティックカメラ」の設定に、ジャイロのラチェット動作中の角度追尾を有効にできるオプションを追加。
Steam Controllerのジャイロで微細なスタッターが発生していた問題を修正。
「トラックパッドロックアウト」をオフにできるように変更。デフォルトでは、対応するジョイスティックが傾けられているか、またはジョイスティックの静電容量式センサーが作動している間は、各トラックパッドが無効になります。 これにより、ジョイスティック使用中のトラックパッドの誤操作を防ぎます。 これは、「設定」>「コントローラ」>「詳細」>「キャリブレーション&詳細設定」>「トラックパッドロックアウト」で設定できます。
グリップセンサーのセンサー設定ページのグリップ範囲スライダーを修正し、説明を変更。
デスクトップモード
ドロップダウンをクリックしたときや、プロフィールにマウスを合わせたときに開くウインドウが画面上に表示されたままになる問題を修正。
Deckを手に入れよう!
Steam Deckを出荷中です。
製品の仕様は今後変更される場合があります。
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