HID power management over USB
HID over USB employs USB suspend to power manage a device.
Power is managed primarily in the following two configurations:
Case 1: The system is in a power managed state (e.g. S3) but the device is armed to wake the system up. E.g. a HID USB keyboard that is armed to wake up a desktop from S3 on key press. NOTE: HID devices don't automatically wake up a system from a low- power state. Only specific HID devices (e.g. Top level collections of keyboards and mice) do this. If an end user wishes to disarm a device from waking up the system, the user can specify this via the properties/power management tab in device manager.
Case 2: The system is in a running state (e.g. S0) but the device has idled out (no user interaction). E.g. selective suspend a HID USB mouse when no one is using or touching it.
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