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I'm trying to connect a MacBook Pro 16" to my external display through DisplayPort with these devices :

But it's not working.

When I plug it in, the external display goes out of sleeping mode, but the MBP does not detect it and after a couple of seconds, the display displays a "no input detected" message and goes back to sleep.

I've tried :

  • Reseting the SMC and NVRAM and tried all 4 usb slots.
  • Switching off and unplugged the display, plugged it back in etc.
  • Restarting in clamshell
  • Force detect the display (the display goes out of sleeping mode, but then wont be detected)

I've tested the cable, adapter and screen with another computer and everything works fine.

Is there something I'm missing here ? Is it possible that my external display isn't compatible ?

== Edit ==

It looks like incompatibility between MacOS and this iiyama model (or I guess this DisplayPort version).

It also seems to be a software problem, since it works under Windows/Bootcamp (!)

I've raised the issue to the Apple support, but of course no answer, and I think no hope of this getting solved.

Basically, I need to buy a new screen... sad.

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  • Just because it works on another computer doesn't mean it will work on a Mac. Macs, annoyingly enough, can be a bit picky with hardware. I'd start with a different brand adapter and go from there. – Steve Chambers Aug 12 '20 at 15:28
  • This is already the second brand I'm trying :-( – Pierre Aug 14 '20 at 9:08
  • I'm having sort of the same problem: Samsung G9 49" screen, DisplayPort to USB-C cable. Trying to connect it to a 2019 MBP 16" (the one with a physical esc-key) - nothing happens. (Tried 3 different 2019 MBP 16"). Trying to connect to an older MBP (2017 I think), and it works. Have you figured out anything? – Morten Berg Dec 9 '20 at 19:58
  • @MortenBerg I couldn't get it to work with DisplayPort and my iiyama display (although it works with Bootcamp and my iiyama display, or with other displays with straight usb-c...). In the end, I bought a straight hdmi to usb-c adapter and it works fine (no hub, hubs with multiple ports also caused troubles when hdmi cable is too long, for far away projectors for exemple). For me, disappointing experience ! :-( – Pierre Dec 10 '20 at 21:05
  • Yes, very disappointing :/ So strange that it works on older MBPs, but not the newest ones. Even stranger that it works on newer MBPs running Bootcamp... – Morten Berg Dec 10 '20 at 21:41
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You just need a simple Type C DisplayPort cable.

The confusion comes from how “USB-C” was implemented. USB-C is just the physical port type. The ports on your MacBook Pro are actually Thunderbolt 3 ports and they use a Type C connector. Thunderbolt has several signals: PCIe, USB 3.x, DisplayPort and Power.

So, that port is natively outputting DisplayPort and the adapter you purchased is an actual video adapter that connects to USB and outputs DisplayPort. It’s not working because your Mac doesn’t have the drivers for that particular adapter.

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  • I just bought a cable instead, let's see if it works then, thanks! – Pierre Aug 14 '20 at 9:08
  • I received the cable (I bought the CableMatters mentioned in the question you linked to) but I still have the same problem. The behaviour is exactly the same as with the adaptor... :-( So I think it might be a compatibility problem between my eternal display and the MPB 16" – Pierre Aug 17 '20 at 16:05
  • What's your display make/model? Can you try a different monitor? – Allan Aug 17 '20 at 16:09
  • I listed the screen model in my question. I will try to find another display to test on yes... This is annoying me a lot :-) – Pierre Aug 18 '20 at 8:26
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    Update... I've tried with BootCamp... And it works fine, so it seems that it's MacOS related and not an hardware issue. Damn... it's working with Windows but not MacOS... And for info, it works with cable AND the DP/USB-C adapter – Pierre Aug 18 '20 at 9:13

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