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PSA: all recent Intel platforms (600 / 700 / 800 series PCH) have issue with full-speed USB devices (like zigbee / serial / ... devices) and going to lower C-States (old.reddit.com)

submitted 4 weeks ago by bot@lemmit.online to c/selfhosted@lemmit.online

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The original was posted on /r/selfhosted by /u/Wirehead-be on 2025-07-15 16:02:53+00:00.

Just got bitten by this issue. TL;DR: if you actively use USB "full speed" devices (so USB1 devices) like Zigbee Coordinators, Serial UART's,.. your CPU pkg will not go lower than C2; thus causing elevated power use for no reason.

600 series - item 13: Errata list

700 series - item 11: Errata list

800 series - item 01: Errata list

None have workarounds, and the Intel forums are less than helpful / tonedeaf.

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