Valve confirms it'll support the ROG Ally with its Steam Deck operating system
Briefly

Valve plans to allow other companies to use its SteamOS, including supporting rival gaming handhelds like the Asus ROG Ally once the platform is ready.
Valve confirmed adding support for extra ROG Ally keys in the latest SteamOS release notes, signaling their intention to expand third-party device support.
Valve designer Lawrence Yang emphasized that the note about ROG Ally keys signifies ongoing work on adding support for additional handhelds on SteamOS.
Read at The Verge
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