U3818DW, MacBook Pro via USB Type-C, USB 2.0


I have the U3818DW 38" USB-C monitor.   I can't believe I am the only one having this issue.   I am using this monitor with 2016 touch bar macbook pro.   USB-C works great.  Charged my mac and also drives the monitor.   However, all the USB ports in the monitor ONLY work at USB-2 speed.  I even tried the USB Upstream cables to see they help. So. How to get the USB ports to work at USB-3 speed when connected to USB-C?

Thank you.

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