Note: This update is for the Steam Deck Preview channel, and includes new features that are still being tested. You can opt into this in Settings > System > System Update Channel.
General
Fixed a case where an SD card with filesystem errors would be mounted as read-only.
Fixed the custom performance overlay presets file inheriting the default settings from the steam presets.
Fixed internal display rotation being erroneously reported to the game.
Firmware 118
Actually added undervolting controls.
External display
Fixed a 3.5 regression with HDMI output.
Fixed a long-standing issue where the internal display backlight would always stay on.
Fixed bug with HDR applications showing in wrong colorspace if they moved their window during swapchain creation.
Fixed HDR not working in 32-bit applications.
Added HDR Analysis to developer settings.
Disabled HDR exposure in "My Little Pony: A Maretime Bay Adventure" as it enables it without rendering in HDR.
Desktop Mode
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Fixed a case where the desktop could be empty and apps would fail to launch.
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Fixed a bug where switching to the Plasma Desktop transition could result in broken colors.
Source: https://store.steampowered.com/news/app ... 8335925159