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Does MacBook Air (11-inch, Early 2015), powered by Broadwell with Intel HD Graphics 6000, and Thunderbolt 2 port (up to 20 Gbps), support DisplayPort 1.2 Multi-Stream Transport?

https://support.apple.com/kb/SP713 mentions nothing about MST.

cnst
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1 Answers1

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TL;DR: NO. Because... The OS does not support MST on your Air. The hardware supports it (see: http://www.notebookcheck.net/Intel-HD-Graphics-6000.125588.0.html):

"All Broadwell GPUs support OpenCL 2.0 and DirectX 12 (FL 11_1). The video engine can now decode H.265 using both fixed function hardware as well as available GPU shaders. Up to three displays can be connected via DP 1.2/eDP 1.3 (max. 3840 x 2160 @ 60 Hz) or HDMI 1.4a (max. 3840 x 2160 @ 24 Hz). HDMI 2.0, however, is not supported."

I have a MacBook Air (13-inch, Early 2015).

I have a matched pair of Dell U2414H monitors that support DP 1.2 (work beautiful on my Win10 gaming machine).

I can get the monitors to "work" on my MBAir using 1.2 (and/or) 1.1 mode on the monitors, but NOT the intended results:

  • With mirroring ON, I get the same (desktop #1) on the MBAir as I do my two monitors (three screens showing the same thing).
  • With mirroring OFF, I get (desktop #1) on the MBAir and (desktop #2) on both of my Dells (one screen showing one thing, two screens showing a duplicated something else).
  • What I would expect is MBAir = Desktop #1, Dell#1 = Desktop #2, Dell#2 Desktop #3

When I go into display preferences I can see that the Mac only sees one monitor attached (not two for a total of three to configure). After a TON of searching and reading the answer was right in front of me:

"Supported displays and configurations"

... Multi-Stream Transport (MST) Displays

These Mac computers support multi-stream transport (MST) displays at 60 Hz:

  • MacBook Pro (Retina, 15-inch, Late 2013) and later
  • MacBook Pro (Retina, 13-inch, Early 2015) and later
  • Mac Pro (Late 2013)
  • iMac (Retina 5K, 27-inch, Late 2014) and later

https://support.apple.com/en-ca/HT206587

Notice anything missing?

IanMerwin
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