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.
- 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.
Case #1 Provisions
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.
Build date: 11/16/2013