By Arch, do you mean Arch Linux? According to https://www.game-debate.com/news/2... | Hacker News

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		CyberShadow on July 15, 2021 \| parent \| context \| favorite \| on: Valve Steam Deck By Arch, do you mean Arch Linux? According to https://www.game-debate.com/news/25482/valve-counts-to-3-ste... , it seems to be based on Debian 9.

jvzr on July 15, 2021 [–]

They specifically mention Arch Linux (with KDE Plasma desktop) in the software specs

SteamOS 2 was Debian-based

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