This is the best summary I could come up with:

Reduced stutters when the upscale filter was set to FSR or NIS under high GPU load.

Fixed an issue regarding frame-pacing and stutter, especially affecting some external displays.

Fixed display sometimes getting stuck at 60Hz after returning from sleep on the Steam UI.

Fixed an issue where a core could be stuck at 100% CPU if a game’s window closed in an unclean way.

This comes shortly after the bigger SteamOS 3.5.8 Preview: Flatlined update a few days ago, as Valve continue cleaning up issues from the rather massive SteamOS 3.5 update that changed a ridiculous amount of the system.

Are there any particular bugs you really want to see solved right now that haven’t been fixed in these two recent Preview updates?

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