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
Improved idle power consumption on Steam Deck when no audio is playing
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
Fixed "Disable Frame Limiter" toggle not working when VRR is enabled
Fixed the frame limiter incorrectly applying to VR titles when streaming from Steam Machine to Steam Frame
Fixed loss of input if a launcher window is accidentally dragged around in Game Mode
Fixed an issue causing frame limits to result in lower than intended FPS on certain external displays
Fixed issues with suspend/resume on systems with RDNA1 or RDNA2 based dedicated GPUs
Fixed audio issues on hotplug of certain monitors in a multi-monitor setup
Fixed an issue causing firmware updates to occasionally fail to apply on Steam Machine
Fixed a system crash when launching Forza Horizon 6 on Legion Go 2
Added preliminary support for Legion Go 2 brightness control
Fixed an issue causing certain games (incl. ELDEN RING and DARK SOULS™ III) to fail to run on recent Panther Lake Intel CPUs
Fixed performance issues in STAR WARS: Galactic Racer on resume from suspend on Steam Machine
Fixed an issue that could lead to GPU errors in The Crew Motorfest
Worked around a firmware issue on some ASUS devices causing excessive fan speed upon waking from sleep
Fixed boot screen corruption on Intel PTL+ devices
Fixed a bug wherein changing the timezone could prevent switching to Desktop Mode until a reboot
Security and stability updates
    Revoked compromised eMudhra CA certificates

Misc

Updated the bootloader to improve compatibility with certain motherboards
The Desktop Mode lockscreen is no longer prevented from being explicitly enabled in settings (but remains off by default)
Fixed logging in to Desktop Mode via RDP with system users when enabled

Developer

Switched WiFi backend to wpa_supplicant by default, improving compatibility with various WiFi networks
    Enhanced wpa_supplicant to support fast WiFi reconnect on resume from sleep, previously only available in the iwd backend
Linux kernel rebased on Linux 7.2
Added preliminary support for hibernation, not yet exposed in Game Mode UI
    Enhanced Linux kernel hibernation support to enable interrupting hibernate requests and fixed various driver issues
    Not yet enabled on Steam Deck due to an outstanding driver bug
Various scripts and packages have been renamed from `steamos-` to `holo-`, with aliases to the former names where appropriate
Improved support for running SteamOS as a VM guest with accelerated graphics (virtio-gpu, venus)
Updated included renderdoc version
Reintroduced support for Android binder IPC