Best way to get 2 external monitors off 1 usb-c?

Discussion in 'MacBook Pro' started by SparkFlash, Aug 10, 2019.

  1. SparkFlash macrumors 6502


    Feb 15, 2013
    On my 2018 15 MBP-TB, I can never quite figure out how to use two external monitors on my USB-C adapter. My adapter has 2 HDMI outputs and the closest I can get it to work is having them mirror each other. It does not recognize them as separate monitors.

    What am I missing? Ive searched and gotten so much conflicting info that I am coming here for advice. Is it not possibe?

  2. Honza1 macrumors 6502

    Nov 30, 2013
    This is a guess, but I think you need to use two usb-c ports in this case. Each monitor needs its own? Get usb-c to hdmi or better display port cable for each monitor - I found this working best for my 4k displays.
  3. Stephen.R macrumors 65816


    Nov 2, 2018
    What adapter do you have? If it’s USB-C (and not TB3) it likely only has the ability to run one display.

    With a TB3 adapter you can run multiple 4K displays. Several companies sell their own branded version of essentially the same adapter that I use:

    OWC also sell a dual HDMI version (looks almost identical), not entirely sure about other vendors on that point.
  4. dwig macrumors 6502a

    Jan 4, 2015
    Key West FL
    macOS does not support dual independent monitors on USB, though it does support such on TB3. It is an OS limitation. Windows 10 does support the appropriate dual channel DisplayPort Alt mode on USB, hence those hubs with dual ports will usually note the difference in functionality. In order to get dual independent displays on a single wire using a Mac, you need to use a TB3 port and a TB3 hub or docking station.

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4 August 10, 2019