Unpower USB devices when powered off

On Librem Mini, is it possible to make a setting in coreboot such that USB ports are unpowered when PC is off? Currently, my external HDDs have the LED on and keep spinning even when the device is off.

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Is it a correct assumption that the boot drive is internal? In that case, is it a possibility to use hdparm.conf to spin down the external drives when not in use, after X seconds - regardless of whether the Mini itself is up or down?

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No, neither coreboot nor the EC can control this on Mini. I agree with the hdparm suggestion, that’s where I would look. Depending on your workload, you could have the disk spin down any time it idles for a configured time, or you could do it when the host is shutting down.

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