BIOS tweak cuts workstation's idle power draw from 180W to 17W during sleep

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A home lab operator discovered his high-end Threadripper workstation was consuming 179.8 watts while supposedly suspended, nearly as much as when fully idle. The problem was traced to Linux defaulting to 's2idle', a software-only sleep mode, instead of true S3 hardware sleep. A $15 energy-monitoring smart plug revealed the waste, which logs and software diagnostics had completely masked. Enabling S3 sleep in the motherboard's BIOS under the APM configuration settings resolved the issue immediately. After the firmware change, the machine's suspended power draw dropped to just 17 watts, with Wake-on-LAN functionality remaining intact.

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