Lost 5K on Dell 2715K after High Sierra clean install

Discussion in 'Mac Pro' started by javinv, Oct 8, 2017.

  1. javinv, Oct 8, 2017
    Last edited: Oct 8, 2017

    javinv macrumors member

    Joined:
    Nov 29, 2014
    #1
    Hi,

    After a clean install of High Sierra I'm no longer able to use my Dell 2715K @ 5K resolution; the usual Nvidia procedure of turning off and on the screen no longer works and I have as well tried with a Sapphire RX580 with the same result: the two panels of the screen separated into a low res display (the visible one) and a ghost display.

    Since the result looks the same on both Nvidia and AMD graphic cards, I was wondering if maybe High Sierra has lost its support for this kind of display (a 5K display with two DP 1.2 connectors).

    Anyone with this same setup has had any luck with it on High Sierra?

    Javier
     
  2. Redneck1089 macrumors 65816

    Redneck1089

    Joined:
    Jan 18, 2004
    #2
    You might need to disable SIP and try running the Terminal script again that MacVidCards provides on his website.

    If that doesn’t work, I’m not sure. I’ll be in the same boat with this screen though, and I was wondering how people were fairing after updating to High Sierra.
     
  3. javinv thread starter macrumors member

    Joined:
    Nov 29, 2014
    #3
    Oh thank you for your help but that’s the first thing I tried and it doesn’t work anymore on High Sierra...
     
  4. William Payne macrumors 6502a

    Joined:
    Jan 10, 2017
    Location:
    Wanganui, New Zealand.
    #4
    The weird thing with the dell 5k is that apple actually does state that it is usable on the mac pro 6,1.https://support.apple.com/en-nz/HT206587 , so why the huge hassle on the cMP's. They even have a section about dual cable displays.

    I have never used a 5k monitor so for me its just odd.
     
  5. Redneck1089 macrumors 65816

    Redneck1089

    Joined:
    Jan 18, 2004
  6. javinv thread starter macrumors member

    Joined:
    Nov 29, 2014
    #6
    The only news I have is that I contacted Rob from Bare Feats and he tested his Dell 2715K with the Vega graphic card that he's been testing with the same result I get with the RX580; no 5K native support.

    Any ideas?
     
  7. Redneck1089 macrumors 65816

    Redneck1089

    Joined:
    Jan 18, 2004
    #7
    Looks like I’ll be holding off on High Sierra then.
     
  8. alaman64 macrumors newbie

    Joined:
    Jan 10, 2017
    #8
    I'm on High Sierra and my Dell 2715K works as it did and better. The better being i'm not getting the cursor problem I used to have on the left side of my screen after sleep. I still have to power on and off after reboot for both halves to sync.
    I am using a hack to do this running 980ti. So if anything then i'm guessing it's the AMD drivers, which really sucks because I was about to sell my 980ti and pickup a Vega 64.
     
  9. Redneck1089 macrumors 65816

    Redneck1089

    Joined:
    Jan 18, 2004
    #9

    When you updated, did you have to enable SIP and then later disable it again to get the 5K resolution back> what steps did you follow?

    Thanks for letting us know.
     
  10. javinv thread starter macrumors member

    Joined:
    Nov 29, 2014
    #10
    When I updated to High Sierra, my 2715K kept on working as it did with Sierra at 5K, I still had the cursor problem tho. To solve this, I exchanged the order of the DP cables and after that (I did it with the computer turned on, when running MacOS) it stopped working at 5K or it hanged up, I don't remember; after that I restarted and 5K never worked again. All this with a 970 GTX. Since it didn't worked no matter what I tried, I read somewhere that I should try to reset PRAM, so I did it and it stopped booting and I had to reinstall High Sierra. After this clean install, 5K never worked again. So I ordered a RX580 hoping that it would work at 5K without the Nvidia web driver problems (EFI boot, cursor, updates...), but it didn't and this is my story.

    I would say that if High Sierra is updated from a working 5K Sierra installation, 5K keeps on working as it did on Sierra, but that there must be something weird that stops it from working very easily.

    What I would really like to know is how did you fix the cursor error? it just disappeared when you updated to HS? which version of the drivers did you install? the first one or the one for the incremental update?

    Thank you!
     
  11. alaman64 macrumors newbie

    Joined:
    Jan 10, 2017
    #11
    The cursor error just disappeared on it's own after updating to High Sierra. AS far as the cables, you should put them back they way they were initially, the order of the cables is very important, it will never work if the cables are reversed.

    Like i mentioned in the beginning the cursor just fixed itself. It Does screw up once in a while, but not as much as it did before. Before it used to break after the display went to sleep, now i think it breaks only when the computer goes to sleep, which in my case is never. So that's probably why I have not seen the cursor bug in a week.

    I'm on the first version of high sierra, i'm not able to do the supplemental update.

    Nick
     
  12. javinv thread starter macrumors member

    Joined:
    Nov 29, 2014
    #12
    Well the first thing I tried was to put them back in the order they were initially without any luck... if this was so simple!

    I’ve tried all possible combinations...
     

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