USB xHCI Runtime Power Management Test

This manual test validates that the USB host controller supports runtime power management correctly, if implemented.

Test details

Associated requirements


See the device hardware requirements.


Windows RT (ARM-based) Windows 8 (x64) Windows 8 (x86) Windows RT 8.1 Windows 8.1 x64 Windows 8.1 x86

Expected run time

~5 minutes


Certification Functional



Running the test

Before you run the test, complete the test setup as described in the test requirements: USB Bus Controller Testing Prerequisites.

You can try running this test with devices attached to the root hub ports; however, if the device doesn’t support selective suspend, the device can prevent the root hub from going into the low power management state necessary to pass this test.

We recommend running this test with all external devices detached from the root hub ports, as this allows the root hub to go into low power state. The test can then prompt you to reconnect the device in order to wake the root hub and continue testing.


The docking station (if it replicates or extends USB ports) is considered an external device and should be removed when the test prompts to remove external devices. You can then replace it when prompted.


For troubleshooting information, see Troubleshooting Bus Controller Testing.

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