PowerDeviceD3: Full sleep state with longest latency in returning to PowerDeviceD0. (Note: Commonly referred to as “off,” however a USB device’s parent port is not powered off, but rather suspended.) ----------------- While in the S3 sleep state, older platforms power off the USB bus. Newer motherboards power the USB bus using auxiliary power while in S3. Examples of motherboards that have this capability use Intel’s 820 chipset.