Can't get native resolution of 3840x2160 on rMB Pro early 2015 with Dell P2415Q

Discussion in 'MacBook Pro' started by dieselgg, Feb 29, 2016.

  1. dieselgg, Feb 29, 2016
    Last edited: Feb 29, 2016

    dieselgg macrumors newbie

    Aug 31, 2010
    Mississauga, Ontario

    I have the 13" retina MB Pro early 2015 and I purchased the Dell P2415Q which has a native resolution of 3840x2160. The 13" rMB Pro early 2015 is capable of 3840x2160 @ 60Hz through the mini display port. I have it connected to the mini DP port from the rMB to the DP of the monitor. The Dell packaging does not indicate whether the cable is v1.2.

    Anyhow, I am not able to select the default resolution of 3840x2160. The default resolution it is displaying is 1920 x1080. When I select 'About this Mac': it does report that it detects the DELL monitor, 24" (3840x2160) Intel Iris Graphics 6100 1536 MB graphics.

    The option resolutions are as follows:

    Could it be that perhaps that Dell supplied a v1.1 mDP to DP cable?

    Any advice on how I can resolve this would be appreciated.
    --- Post Merged, Feb 29, 2016 ---
    I figured it out. You have to select alt/option while clicking on 'scaled' in Display under System preferences to reveal the extra resolution options.
  2. Freyqq macrumors 601

    Dec 13, 2004
    Those are all hi-dpi scaled resolutions. It's operating at 4k but the UI is scaled to appear as they would be at the listed resolution.

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