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Can I connect a 2018 MacBook Pro to a Dell UltraSharp 27 4K Monitor (U2718Q) with a single cable that carries both the display data and the data for the USB ports of the display?

I tried a USB-C to DisplayPort cable, but none of the USB ports of the display would work until I also connected it to the MacBook Pro with a USB cable through one of it's USB upstream ports.

Note that I want to operate the display at full resolution (4K, 3840 x 2160) and a refresh rate of 60 Hz.

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No.

Technically speaking, you have a Thunderbolt 3 Type C port. "C" is the physical charastic of the port, not the USB specification. Being that it's Thunderbolt 3, its carrying several signals:

  • PCIe
  • USB 3.1
  • DisplayPort
  • Power

Your "end" device is a monitor that has several different inputs

  • HDMI
  • DispayPort (DP)
  • Mini DisplayPort (mdP)
  • USB

When you go from your MacBook's TB 3 port to the video in, you're not passing the USB signal; this is why you need a second cable for the USB functionality. If this was a monitor that accepted Thunderbolt as an input, you could do this with one cable.

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Dell UltraSharp 27 4K Monitor (U2718Q) DisplayPort

does not redistribute the input to its USB's.

Dell

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