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Valve released SteamOS 3.8.28 Beta on September 23, 2026, with a targeted fix for game performance that could deteriorate after a system entered sleep and resumed. The reported problem affects systems using discrete AMD GPUs.
A separate Steam Client Beta for all supported platforms addresses several input and streaming problems, including three faults involving the recently added Remote Play: Pyrowave video codec. Both releases are beta updates focused on reported issues rather than broad feature additions.
SteamOS Resume Fix
SteamOS 3.8.28 Beta contains a single listed change: correcting the potential decline in game performance following a sleep-and-resume cycle on hardware with a discrete AMD GPU. The source does not specify affected GPU models, games or the conditions required to reproduce the slowdown.
Pyrowave Streaming Changes
The Steam Client Beta fixes occasional flickering when Remote Play streams are received by Linux and SteamOS clients. Valve also moved encoding work to the GPU compute queue to reduce contention with GPU resources used by the running game.
Another correction targets a client-side GPU memory leak triggered by frequent resolution changes. These changes apply to Pyrowave, the video codec introduced in an earlier Steam Beta, and remain part of the beta client rather than the stable release described by the source.
Keyboard And Controller Repairs
Outside Remote Play, the client update restores the on-screen keyboard in non-Steam games after Wi-Fi is toggled or the device is suspended. It also corrects the button glyphs displayed for the paddle controls on the Xbox Elite Controller.
Source: SteamOS 3.8.28 Beta released, plus another Steam Client Beta with Remote Play: Pyrowave fixes
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