>>975
FAQ - DisplayPort
https://www.displayport.org/faq/#tab-displayport-over-usb-c

How do I know which end of the cable to plug into my device?

The USB Type-C to Type-C cable is reversible, and so is the USB Type-C to DisplayPort adapter cable.
These can be plugged in either direction. The USB Type-C to HDMI, DVI, and VGA converters need to
be plugged into a video source device that has the USB Type-C connector.

ということなので
実際の製品がどうかは分からないですけど