Classic Mac Pro 4,1 -> 5,1 driving Ultrafine 5K full resolution.

Discussion in 'Mac Pro' started by EddieK420, Oct 24, 2018.

  1. EddieK420, Oct 24, 2018
    Last edited: Oct 24, 2018

    EddieK420 macrumors member

    EddieK420

    Joined:
    Jan 28, 2009
    #1
    I was able to get my classic Mac Pro to drive the LG Ultrafine 5K at full 5K resolution retina mode enabled.

    I used an Gigabyte Alpine Ridge Thunderbolt 3 card inside my Mac Pro. 2 DP cables go from my Nvidia GTX 1080Ti to the Alpine Ridge then the Thunderbolt 3 cable goes from the Alpine Ridge to the Ultrafine 5K.

    In Windows under Bootcamp everything worked fine immediately at full 5K resolution.

    Under MacOS (10.13.6) though I would get a black screen. Using the tutorial and kext files here: https://www.tonymacx86.com/threads/...-5k-full-5k-60hz-success.240730/#post-1654966 I was able to get it to work under MacOS and it works under 5k resolution. It worked in retina mode at once. No need to use SwitchResX at all. It does take 2 Display Ports cables to achieve 5K resolution. (Of course speakers, usb and webcam do not work since my MacPro does not really support Thunderbolt but image still works!)

    I have 2 displays connected to my Mac Pro. A 27" LED Cinema Display the LG Ultrafine 5K. They use all 3 Display Ports on my GTX 1080Ti (2 display ports for the Alpine Ridge/LG 5K and 1 display port for LED Cinema Display. I have attached some pictures :)


    THANKS A LOT!! To @Aerror from TonyMacX86 forums for the kext patch and tutorial and the @ITSAGE for sharing so much knowledge!
     

    Attached Files:

  2. h9826790, Oct 25, 2018
    Last edited: Oct 25, 2018

    h9826790 macrumors G5

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #2
    Wow~ nice! You are the very 1st one on the world that I know successfully power a 5k Thunderbolt Display on a cMP.

    Will put this thread into the sticky upgrade thread now.
     
  3. Pressure, Oct 25, 2018
    Last edited: Oct 25, 2018

    Pressure macrumors 68040

    Pressure

    Joined:
    May 30, 2006
    Location:
    Denmark
    #3
    Someone did it a in 2017 here with an adapter that supports DisplayPort Alt-Mode or the GC ALPINE RIDGE.
     
  4. h9826790 macrumors G5

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #4
    Thanks for the info. I didn’t scan through that remaining ~20 pages yet. But on that particular page, it’s a Dell 5k monitor.

    I consider that’s a bit different. We know that the Dell 5K monitor can work with cMP few years back. In that page, “can drive the LG 5K UltraFine Thunderbolt Display” is still just a theory.

    And now, this is a proved can really work.

    Only “can drive 5k Display” can be very different than “can drive 5k Thunderbolt Display”.

    E.g. all cMP can drive the 27” 1440P ACD. But no one ever success to drive the 27” 1440P Thunderbolt Display by a cMP.

    So, it’s good to I know that we can now really use that Apple blessed LG 5K UltraFine Display.
     
  5. kings79 macrumors regular

    kings79

    Joined:
    Sep 16, 2015
    #5
    Is this a cold macOS boot or a warm boot from Windows?
     
  6. EddieK420, Oct 25, 2018
    Last edited: Oct 25, 2018

    EddieK420 thread starter macrumors member

    EddieK420

    Joined:
    Jan 28, 2009
    #6
    In MacOS after installing Aerror Nvidia 5K kexts and using his boot arguments I can boot from a restart or a shutdown or sleep with both the 27 Led Cinema Display and the LG 5K plugged in. No problem everything works.

    In Windows 10 bootcamp I have to boot with only the Led cinema display connected. Otherwise both screens go black after the windows loading screen. Only after Windows 10 is loaded I can plug in the thunderbolt cable on the back of the LG5k and everything works fine in windows too.

    I heard there is this little program to control the brightness I'm gonna check that out later too.
     
  7. EddieK420 thread starter macrumors member

    EddieK420

    Joined:
    Jan 28, 2009
    #7
    I got a reply from joevt on the tonyx86mac forums. He says that with another card (TITAN RIDGE) you can also get thunderbolt working and get the usb speakers and other functionality from the LG5K that is not working right now with the Alpine Ridge. Check it out:

    If you used a GC-TITAN RIDGE instead of a GC-ALPINE RIDGE then you could get PCIe tunneling over Thunderbolt to work in Windows to support the USB functions of the LG UltraFine 5K display. They will continue to work after a warm boot to macOS. I think sleep/wake is still a problem though.

    With the GC-TITAN RIDGE, you can enable USB functionality even from cold boot into macOS using a jumper wire, but Thunderbolt functionality still requires warm boot from Windows.
    https://forums.macrumors.com/threads/testing-tb3-aic-with-mp-5-1.2143042/page-3#post-26680055
     
  8. kings79 macrumors regular

    kings79

    Joined:
    Sep 16, 2015
    #8
    All sounds very promising.

    Are total cold boots out of the question?

    Dare I mention data transfer?
     

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7 October 24, 2018