This is the best summary I could come up with:

Valve has now released the latest SteamOS 3.5.1 Preview for download, fixing up some more issues in the Steam Deck OS like the backlight staying on when docked.

Fixed a case where an SD card with filesystem errors would be mounted as read-only.

Fixed internal display rotation being erroneously reported to the game.

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 a bug where switching to the Plasma Desktop transition could result in broken colors.

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