No signal on external displays after mojave update 2018

Discussion in 'macOS Mojave (10.14)' started by jesse550, Jul 17, 2018.

  1. jesse550 macrumors newbie

    jesse550

    Joined:
    Jul 13, 2018
    #1
    So finally...got mojave installed on my 2018 MBP and now external displays do not work. These cables and dock were working perfectly fine before. Tested on another mbp as well and they work fine.

    I tried nvram reset and smc reset...no beans. Also installed the latest displaylink drivers...no beans.

    Anyone else experiencing this?
     
  2. makdeniss macrumors regular

    makdeniss

    Joined:
    Apr 26, 2011
    Location:
    European Union
    #2
    I have the exact same problem with iMac Retina 2015 and Dell 2718Q 4k display - it just doesn't wake up. The only thing that helps is pulling the cable out and then back in. I am running PB2 on that machine. Maybe PB3 solved this issue.
     
  3. themp Contributor

    themp

    Joined:
    Jun 18, 2011
    #3
    Same problem on two thunderbolt displays running on 2018 MBP. Interestingly, audio on displays still work and peripherals plugged into displays (as well as Ethernet) do work. Just no display video signal.
     
  4. makdeniss macrumors regular

    makdeniss

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    Apr 26, 2011
    Location:
    European Union
  5. nikster0029 macrumors 6502

    nikster0029

    Joined:
    Jul 21, 2010
    #5
    my ultra fine 5k doesn't work on my 2018 mbp either
     
  6. Uhu macrumors regular

    Joined:
    Feb 4, 2010
    #6
    My two LG 4K screens over thunderbolt to DisplayPort don’t work either after the Update.
    (Made an extra Thread about that. I hope it gets deleted)
    Anyone of you had success in the meantime ?
     
  7. Uhu macrumors regular

    Joined:
    Feb 4, 2010
    #7
    I did not find a solution. Going back to HS for now after submitting the bug report
     
  8. stevespa macrumors member

    Joined:
    Mar 18, 2009
    #8
    Same. My 5K didn't work in Mojave, I filed a bug report and downgraded. I spoke with Apple support, and we tried some things, but eventually came to the "it's beta, so you're on your own". Works fine in High Sierra again.
     
  9. Uhu macrumors regular

    Joined:
    Feb 4, 2010
    #9
    me zoo. HS works very well
     
  10. Uhu macrumors regular

    Joined:
    Feb 4, 2010
  11. Stux macrumors member

    Joined:
    Jun 25, 2018
    #11
    LG5K doesn't work on my 2018 MBP with Mojave either.
     
  12. Uhu macrumors regular

    Joined:
    Feb 4, 2010
    #12
    On the newest beta?
     
  13. Stux macrumors member

    Joined:
    Jun 25, 2018
    #13
    Haven't tried since a couple of days ago. Was on 18A336 when I did
     
  14. makdeniss, Jul 31, 2018
    Last edited: Jul 31, 2018

    makdeniss macrumors regular

    makdeniss

    Joined:
    Apr 26, 2011
    Location:
    European Union
    #14
    Looks like monitor problem is fixed...
    EDIT: nope... still there :(
     
  15. geolee11, Jul 31, 2018
    Last edited: Jul 31, 2018

    geolee11 macrumors newbie

    Joined:
    Jul 28, 2018
    #15
    I didn't have any signal at all before regardless of what I did. Now my external display works. I haven't tried putting my computer to sleep and waking it though.

    Update: Display still works after waking from sleep.
     
  16. Uhu macrumors regular

    Joined:
    Feb 4, 2010
    #16
    So whats the case now? Does it work or doesn't it? :)
     
  17. Stux macrumors member

    Joined:
    Jun 25, 2018
    #17
    Just installed PB4 and now the LG5K is working on my MBP2018
     
  18. jesse550 thread starter macrumors newbie

    jesse550

    Joined:
    Jul 13, 2018
  19. Jdeck macrumors member

    Joined:
    Nov 4, 2012
    #19
    Is anyone using an elgato dock and can confirm if it’s working or not?
     
  20. jesse550 thread starter macrumors newbie

    jesse550

    Joined:
    Jul 13, 2018
    #20
    I bit the bullet and installed it. I have the elgato dock. I can confirm external displays are now working. Running 2 4k monitors @60hz with the dock
     
  21. njarif macrumors newbie

    Joined:
    Jun 27, 2014
    #21
    --- Post Merged, Oct 3, 2018 ---
    I have the same issue on my 2017 iMac, I have a Dell 2718Q connected via thunderbolt and it has been working fine until I upgrades macOS with Mojave. Now I have to cycle power on the 2718Q every time after my iMac wakes up from a sleep. If there is a fix or a workaround, please provide, Thanks
    --- Post Merged, Oct 3, 2018 ---
    I also performed a PRAM reset but it dd not solve issue
     
  22. neliason macrumors 6502

    Joined:
    Oct 1, 2015
    #22
    I have an old 21” Samsung LCD from 2005. It is hooked up to my 2012 iMac via a display port to DVI connector. It is acting odd under Mojave. It wakes and seems to work. But sometimes it will go through a period where an ‘Auto Adjustment’ message pops up on it. I believe this occurs when it first gets a signal. It can do this for a while and then stop. In my case it mostly seems to work but you have this annoying message that can last a while. Unless this is a coincidence of it going bad now there might be something off in Mojave in regards to external monitors.
     
  23. makdeniss macrumors regular

    makdeniss

    Joined:
    Apr 26, 2011
    Location:
    European Union
    #23
    couldn't find a fix for this. Tried different solutions including upgrading the monitor firmware through windows boot. The only thing that helps now is that after turn on / sleep I press the monitor source button multiple times -> select auto quickly and that makes the monitor work / wake up.
     
  24. stewstew22, Oct 15, 2018 at 6:37 AM
    Last edited: Oct 15, 2018 at 6:46 AM

    stewstew22 macrumors newbie

    stewstew22

    Joined:
    Monday
    #24
    I have figured out that my external monitors only work when the connector has a power supply connected to the usb-c port. That wasn't a requirement before. Once I completed a SCM reset (held down cntrl+option+command+power button for 10 seconds after turning off mac) I could remove the powersupply, then I had to unplug the hdmi cord and plug it back in.
     
  25. Scrivener, Oct 19, 2018 at 11:38 PM
    Last edited: Oct 19, 2018 at 11:51 PM

    Scrivener macrumors member

    Joined:
    Jun 17, 2009
    #25
    --- Post Merged, Oct 19, 2018 at 11:49 PM ---
    Yes, EXACTLY the same problem and have tried everything I can find to solve it - but I can't crack it. I do mean everything! I have an external LG 27UK850 4k monitor that worked perfectly before and now it will not connect to my Mojave iMac. It will connect to a TV tuner or DVD player and function perfecty in HDMI. But Display port and the USBC (the reason I dropped $900Aus on the monitor) has rendered my inverstment a total turkey. V5 of the DisplayLink software won't even load - no matter how many privileges I give it. It shows a proper Certificate from Apple but the splash sceen shows: "DisplayLinkDriver can't be installed on this disk. is Downgrade"

    Come on Apple - what the hell is happenning to you. While your stuff is getting prettier it is getting more and more useless and troublesome with every release.

    I NEED functionality, not a dead moniotor because I trusted you. No matter how pretty Mojave is - it doesn't work properly.

    I NEED this monotor to work damn it! Digitus Extracus Apple.
     

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