How to disable "always on" USB power on Macbook Pro

I am operating my MacBook Pro early 2015 within a Henge dock (HD03VA13MBPR) , connected to two external displays and external speakers. Both displays and speakers get power from a power distributer that offers a switch via USB. Whenever the USB has power, the monitors stay on. Take off USB power, and the displays shut down.

Now, that setup worked perfectly on my other computer, where USB Power could be configured. On my new powerbook the displays stay on. The USB Port seems to be "always on" during sleep mode.

How can I disable the "always on" function of the USB port while the MacBook is in sleep mode?

Solution 1:

This seems not to be possible. I solved the situation now with the help of my dell external displyay. The USB-Hub there can be configured to shut down as soon as the display ist switched off. So the second display and the active speakers are connected to the power plug that can be switched off/on by USB power. This will allow with the klick of one button to switch all other devices off/on.