Can someone confirm if MST/displayport daisy chaining works on High Sierra?

Discussion in 'macOS High Sierra (10.13)' started by nick0, Jun 16, 2017.

  1. nick0 macrumors newbie

    Joined:
    Oct 27, 2011
    #1
    Always had this problem with mac, apparently high sierra supports MST
     
  2. lu0s3r322 macrumors 6502a

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    Nov 28, 2005
    Location:
    Illinois, USA
    #2
    bump, ive heard reports of this as well but am unable to test this out currently
     
  3. ha1o2surfer macrumors 6502

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    Sep 24, 2013
    #3
    I will try it in about an hour and report back.
     
  4. lu0s3r322 macrumors 6502a

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    Nov 28, 2005
    Location:
    Illinois, USA
    #4
    I eagerly await your findings!
     
  5. marcovk macrumors newbie

    marcovk

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    Netherlands
  6. DelGurth macrumors newbie

    DelGurth

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    Jun 8, 2017
    #6
  7. Arthur44 macrumors newbie

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    Nov 22, 2016
    #7
    Another guy said:
    Any update from a forum member ?
     
  8. DelGurth macrumors newbie

    DelGurth

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    Jun 8, 2017
    #8
    Actually I didn't refer to his post since first of all I've problems with him driving 4x 4K AND 3X 3440x1440. Per displayport 1.2 stream you can only have 1 4K monitor, so that can't be done using chaining (at least not with displayport 1.2). And there are just not enough ports in macbooks, and the mac pro is specified in only being able to drive 3 4K monitors. So on what hardware is this guy running this 7 monitor setup?

    I think he/she is a troll. He claims you can apply WD40 to a HDD in order to lube the bearings again. And that the hole in a HDD is there to do just that. In fact this hole is to equalize air pressure. (Hope the guy on reddit didn't try to lube his HDD...).

    But yes, would love an update from someone who got it working (, or not so that we know that it's not going to happen). Currently I need to switch both monitors in order to switch between my windows desktop and macbook. I would love that I could just use one switch and have the other stick.
     
  9. fabienpascal macrumors newbie

    fabienpascal

    Joined:
    Jul 9, 2017
    #9
    It doesn't work. I just tried with my two DELL U2715H, both with DisplayPort 1.2 enabled, and my MacBook Pro 15,4" Mid-2015 with Radeon M370x.
    Two methods tried:
    1) Mac Mini-Displayport to Dell #1 Displayport input -> Dell #1 Displayport output to Dell #2 Displayport input.
    2) Mac Thunderbolt to OWC Thunderbolt 2 Hub -> OWC TB2 Mini-Displayport to Dell #1 Displayport input -> Dell #1 Displayport output to Dell #2 Displayport input.
    In both scenarios, Dell #2 mirrors Dell #1. System Report in High Sierra only shows the internal display and one external Dell display.
    Conclusion: This beta of High Sierra doesn't bring any changes to DP MST Daisy chaining support. I have submitted a feedback with the Beta feedback app and we'll see. Since Apple is working on eGPU support and improved GPU drivers, there is still hope that it'd work.
     
  10. DelGurth macrumors newbie

    DelGurth

    Joined:
    Jun 8, 2017
    #10
    I hope your feedback helps on this subject.

    Not sure why they are not working on support for this. In the past you could say that it was a selling argument for the thunderbolt displays. But since that line is discontinued, I was hoping that they would remove/fix this limitation now.
     
  11. mindfrost82 macrumors newbie

    mindfrost82

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    Jul 14, 2017
    #11
    Instead of daisy chaining the monitors together, do you think something like this might work?

    https://www.cdw.com/shop/products/S...Type-C-2-Port-MST-Hub/4282292.aspx?pfm=srh#PO
     
  12. DelGurth macrumors newbie

    DelGurth

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    Jun 8, 2017
    #12
    I don't think so, since it relies on the same technology. They also only specify that it's working on Windows®.

    And they make it clear in the FAQ:

    Before You Buy
    Will this MST hub work in Mac OSX?
    Recent versions of DisplayPort include the ability to split to multiple displays from one DisplayPort connection using Multi-Stream Transport (MST).

    Although you will be able to connect the MST hub to the Mini DisplayPort (mDP) connection on your Mac, Mac OSX does not support MST for NVIDIA and Intel Graphics Processor Units (GPUs). This results in a mirrored image across the outputs of a MST hub and you will not be able to have multiple independent displays on your Mac.

    The limitation of NVIDIA and Intel GPUs lies within Mac OSX. If a different operating system is used, such as Microsoft Windows via Bootcamp, you may be able to use the MST functionality of your Mac.​
     
  13. mindfrost82 macrumors newbie

    mindfrost82

    Joined:
    Jul 14, 2017
    #13
    Thanks, I didn't even see the FAQ part, I guess I got my hopes too high. Going to try to use a Thunderbolt 3 monitor connected to the Macbook, then use the Elgato or CalDigit dock and connect that monitor to it along with a 2nd monitor. Supposedly that setup works even on Sierra.
     
  14. ScottLJost macrumors newbie

    ScottLJost

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    Sep 23, 2017
    Location:
    Austin Texas USA
    #14
    I know this is a High Sierra thread, but this could be useful to @mindfrost82 or someone:

    Using MacOS Sierra 10.12.6, I tried the Lenovo DisplayPort to Dual-DisplayPort adapter (splitter) along with a USB 3.1 Type C (USB-C & Thunderbolt 3 Port Compatible) to DisplayPort Ultra HD 4K@60Hz Female Adapter to connect my MacBook to identical Dell monitors.

    Dongle paradise, I know. I wasn't surprised when it didn't work. It just looks ugly. My MacBook screen flashes as it attempts to sync but it never connects nor does it stop flashing until you unplug the Lenovo adapter from the Mac. Trigger warning!

    I'm guessing a protocol translation isn't taking place (Thunderbolt 3 to DisplayPort 1.2 MST???) and it just keeps trying to say hello.


    I'm still searching for a solution, now on Sierra or later on High Sierra. Any successes out there?
    Has anyone tried the Elgato
    dock?

    Thanks all!
     
  15. mindfrost82 macrumors newbie

    mindfrost82

    Joined:
    Jul 14, 2017
    #15
    I haven't tried the Elgato Dock, but I started deploying the CalDigit dock and it seems to be working great. I tried to detail my setup here: https://www.tecklyfe.com/macbook-pro-displayport-mst-daisy-chaining-dual-monitor-solution/
     
  16. emlee macrumors newbie

    emlee

    Joined:
    Nov 10, 2017
    Location:
    Canada
    #16
    I noticed you mentioned that you had both monitors with dp 1.2 enabled...
    According to the article below the last monitor in the chain needs to have dp1.2 disabled to 'terminate' the chain. https://www.dell.com/support/articl...r-daisy-chaining-on-intel-hd-graphics?lang=en, the last monitor in the chain needs to have dp1.2 disabled.
     
  17. fabienpascal macrumors newbie

    fabienpascal

    Joined:
    Jul 9, 2017
    #17
    Thanks for highlighting this.
    I am gonna give it a try on Monday and let you if it helps to turn off DP1.2 on the display at the end of the chain.
    Cheers,
     
  18. fabienpascal macrumors newbie

    fabienpascal

    Joined:
    Jul 9, 2017
    #18
    Hi Emlee,
    I gave a try on what Dell recommends. It doesn't work. Both displays are still mirror and macOS only recognized one (the primary).
    My MacBook Pro (Mid-2015) with discrete GPU runs on High Sierra 10.13.1.
    Hope it helps.

    [​IMG]
     

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