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I am trying to get this system to run:

  • Laptop lid closed.
  • 1 Monitor connected with DVI-miniDP adapter to a thunderbolt port
  • 1 Monitor connected with DVI-miniDP adapter to a thunderbolt port
  • 1 Monitor connected with a DVI to HDMI port on the HDMI port.

I can only get the notebook to recognise 2 of these displays. I can get the third display to work, only if I disconnect an existing one.

Interestingly, if I replace one of the DVI-miniDP displays with a VGA-miniDP adapter on one of the TB ports, then all 3 displays work. Yet I don't want to keep a displayed with VGA (for obviously limitations), so I was wondering if some can provide some pointers on how to make this setup work correctly.

Running 10.10.4

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It depends which MacBook you have. The cheaper ones only have integrated graphics processor (Intel Iris Graphics 6100) which runs from your CPU. The expensive ones have a separate graphics card (AMD Radeon R9 M370X) with 2Gb memory which supports more display or higher resolution displays.

Macbook with integrated Intel graphics:

Dual display and video mirroring: Simultaneously supports full native resolution on the built-in display and up to 3840 by 2160 pixels on up to two external displays, both at millions of colors.

Macbook with AMD graphics card:

Dual display and video mirroring: Simultaneously supports full native resolution on the built-in display and up to 3840 by 2160 pixels on up to two external displays, both at millions of colors.

Source: Apple MacBook Pro Retina specs - Graphics and Video support

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    Given the information above, it is clear that the MacBook Pro can only support two external displays, despite the availability of three ports with display capability.
    – IconDaemon
    Commented Aug 18, 2015 at 11:59
  • Thanks for the response. The model in question has a discreet AMD GPU. The assertion of only 2 external displays is not correct, as right now I am running the system with 4 displays (the three mentioned in the question + the laptop screen). Yet, one of them is connected using a VGA-to-miniDP adapter on the TB port. Switching that to DVI-to-miniDP causes the display to not be recognised.
    – Luis Delgado
    Commented Aug 18, 2015 at 14:28
  • Isnt that adapter faulty maybe?
    – emotality
    Commented Aug 18, 2015 at 14:35
  • Nope, I have tested the adapter with the other display that has a DVI cable, it works.
    – Luis Delgado
    Commented Aug 18, 2015 at 14:38

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