I have same problem with VIVE PRO, a great and expensive laptop with geforce 1080 and i7 7700, but no displayport output.
I wasted a lot of time tring with hdmi port adapters and cables wituout success...
The only alternative is a type-c port, is there anyone in the world that used a vive pro on type-c port ??
For example using this adaptor: https://www.amazon.com/Thunderbolt-DisplayPort-Benfei-Converter-ChromeBook/dp/B01NBX352B
thank in advance