2012 Mac Mini Glitches After Starting up in 4K

Discussion in 'Mac mini' started by redheeler, Dec 26, 2014.

  1. redheeler macrumors 603

    redheeler

    Joined:
    Oct 17, 2014
    #1
    I've been having trouble with graphics glitches on my headless 2012 Mac Mini (base model upgraded to 6 GB RAM) running Mavericks 10.9.5 when it starts up in 3840x2160 (4K). When I change to a resolution lower than 4K and restart, it returns to normal and stays that way even after changing the resolution back to 4K.

    Edit: Using an HDMI display emulator to achieve these resolutions.

    Starting up in 3840x2160 (4K)
    [​IMG]

    Starting up in 3360x1890 and changing back to 3840x2160
    [​IMG]

    Does anyone know what is going on here?
     

    Attached Files:

  2. nollimac macrumors regular

    nollimac

    Joined:
    Oct 10, 2013
    #2
    What kind of emulator are you using to achieve 4k headless? Is it taking 1080p and converting it upwards? I may be wrong; however, I believe you can only get what you started with.
     
  3. redheeler thread starter macrumors 603

    redheeler

    Joined:
    Oct 17, 2014
    #3
    It's simply a dongle that plugs into the HDMI port to emulate a connected display with supported resolutions up to 4K.
     
  4. nollimac macrumors regular

    nollimac

    Joined:
    Oct 10, 2013
    #4
    Had hoped for the name/maker!
     
  5. redheeler thread starter macrumors 603

    redheeler

    Joined:
    Oct 17, 2014
    #5
    fit Headless 4K, I believe it is the only one on the market.
     
  6. nollimac macrumors regular

    nollimac

    Joined:
    Oct 10, 2013
    #6
    Thanks...I am running my 2012 Mini headless as well via an emulator; however, I still have the emulator hooked up to a HDMI switch to a 1080p projector. That way I always get 1080p when I share screen with the MacBook Pro.

    So, in your case, I don't know whether you need a 4k TV to switch back and forth even though the TV is off. Sometimes being first on the market doesn't mean a great mouse strap.
     

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