Mac Mini 2012 and 4K monitor

Discussion in 'Mac mini' started by beerglass007, Nov 11, 2016.

  1. beerglass007 macrumors 6502

    Joined:
    May 13, 2008
    #1
    Hi all

    I just bought a second hand 2012 Mac Mini for a small project i'm doing

    I have a Dell 4K 24" monitor which I use with my Mac Book Pro 15" 2015 via display port

    When I connect the Mac Mini via the display port I dont get any picture, it only works with HDMI

    Will the 2012 Mac Mini support the 4K monitor, i'm not looking for 4K but surely it can do 1080P to the monitor ?

    Thanks
     
  2. Fishrrman macrumors G4

    Joined:
    Feb 20, 2009
  3. campyguy macrumors 68040

    Joined:
    Mar 21, 2014
    Location:
    Portland / Seattle
    #3
    Assuming the Mini's mDP port is working, it should work without issue but with caveats. The mDP>DP cables shipping with the Dell display does have a "DP" symbol on it, but COXOC cables are "compatible" and not "compliant" with DP specs - they don't fully convey EDID info between a PC/Mac and an attached display. I fixed this issue by swapping in a compliant cable. A workaround is to unplug the display, wait a few seconds, plug in the Dell cable leading from the Mac you want to connect to the display, then plug in and power on the display.

    I use my two P2715Q displays with my late-2013 rMBP, and often use one of the two displays with my 2012 Mini Server. I get a default of 1440p @60Hz with the Mini, but with a DP-compliant cable; I got 1080p with the Dell cable, which has been binned. With a DP-compliant cable, no more power issues.
     
  4. beerglass007 thread starter macrumors 6502

    Joined:
    May 13, 2008
    #4
    The monitor is a 24 inch Dell P2415Q 4K IPS Monitor and runs well with a MBP 15"

    The cable works fine with that
     
  5. beerglass007 thread starter macrumors 6502

    Joined:
    May 13, 2008
    #5
  6. campyguy macrumors 68040

    Joined:
    Mar 21, 2014
    Location:
    Portland / Seattle
    #6
    You've missed my point and/or I should have been more clear. If a compliant cable connects a display to a computer, EDID information will be conveyed between the two pieces of hardware. Dell's cables are not compliant - I've tested over a dozen (I own and run a small engineering company...), including my own two displays. Look at the name of the display in the Displays Pref Pane or the System Information app - mine reads "DELL P2715Q", without any hacks - use Google's search engine for "dell display edid hack", and you'll get an idea of what I'm alluding to. The stock Dell cable does not work properly - bust out your multimeter like I did!

    The more-relevant point is that some of your rMBP info is loaded into your Dell displays firmware, and that is what your display is "looking for" as a compatible display - but the Mini doesn't have the same capabilities as your rMBP over DP, and the non-compliant cable can't carry/handshake the "new" data. Look up "displayport power over pin 20" and what can happen, at a minimum, to a GPU or dGPU. Your Mini's capabilities aren't being conveyed to the display over DP - and I'd bet that it works fine over HDMI with either Mac, 100% of the time.

    I've got 7 Mini Servers attached to Dell displays, with compliant Accell cables. They work 100% of the time, every day. Good luck.
     
  7. ious219 macrumors newbie

    ious219

    Joined:
    Oct 17, 2016
    #7

    Does your Monitor support Picture By Picture Mode. I have Samsung monitor that does and can get 4K at 60hz this way using two display port cables.
     
  8. BeatCrazy macrumors 65816

    Joined:
    Jul 20, 2011
    #8

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