hi support team,
customer asks me about out 840 usb state, if we have usb low power state as below:
and below is listed in our spec or in the USB standard,
however There is no direct correlation between the device power states defined in the WDM power model and the device power states defined in the USB standard.
Regards,
William.
Hi!
There is some info in this white paper: https://www.usb.org/document-library/understanding-wdm-power-management-v11
https://www.usb.org/sites/default/files/wdm_pm11.pdf
end of page 7:
page 8:
"For device power states, there is no difference in the status of a device’s parent port between the three device sleep states: PowerDeviceD1, PowerDeviceD2, and PowerDeviceD3. Powering down into any of these power states result in the device being suspended. For USB, there are basically two power categories: fully powered or suspended."
