
While SteamOS 3.0 has been around for a while now, launching with the OG Steam Deck back in 2022, we've yet to properly test a non-Deck handheld making use of the Linux-based operating system. The SteamOS version of the Lenovo Legion Go S should be coming this May, however, and it looks like Valve is laying the grass roots of support down in its SteamOS 3.7.0 Preview: Pi Day update.
The release notes confirm that this particular update, available in the Preview channel only, ships with the "beginnings of support for non-Steam Deck handhelds." The Lenovo Legion Go S is the only one we're currently aware of, although it'd make sense that more are likely to follow in the next few years.