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You might doubt it, but it's entirely true. Apple aggressively cut power to unused devices and provide out of band mechanisms to generate wakeup notifications. Apple will entirely cut power to an SDHCI or Thunderbolt controller that's not in use. Windows won't.

There's nothing secret about this. Anyone who spends a while looking at the ACPI tables will see it. Recent versions of ACPI provide a standardised mechanism for doing this, but Apple have chosen to continue using their custom implementation.




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