bwen1 :
This is happening to me too.
I contacted asus support and this is what I got in reply:
"Thank you for contacting ASUS Technical Support.
I understand that your motherboard USB ports stay powered after shutdown.
I apologize for the inconvenience caused. I will be more than happy to help you.
In this case, I request you to follow the troubleshooting given below and let us know the result so that I will be able to proceed further.
1. Please enable EUP or ERP on your UEFI BIOS settings.
2. If the issue still persists, please go to Device manager -> USB->Power management,and select "Allow the computer to turn off this device to save power"."
I tried using their suggestions, but again the LED was still on. I have all of the passive charging options off in the bios and the power management options were already checked. I have no idea what is going on!