1920x1080 HiDPI on older iMacs

Discussion in 'iMac' started by Bacci, Feb 2, 2015.

  1. Bacci macrumors newbie

    Sep 11, 2012
    My setup is a mid 2010 27" iMac (11,3) with a Philips 288p 28" 4K external monitor, running OS X 10.10.2 at the moment of this typing.
    Managed to get 1920x1080 working in HiDPI on the Philips (based on 3840x1440@30Hz) which looks awesome. The old iMac can run its own screen at 2560x1440@60Hz at the same time.

    I'm looking for a way to match screen scaling however, which would be easier to work with in extended desktop mode.

    The options are:
    - to just run the iMac's monitor in 1920x1080 but that looks too blurry.
    - to run the iMac in 1920x1080 in HiDPI based on its native resolution
    - to scale the Philips to 2560x1440 based on 3840x2160@30Hz.

    Up until OS X 10.9 it was possible to create a scaled resolution in SwitchResX higher than the monitor's capabilities, which would result in seeing a HiDPI mode at 1/2 of that resolution.
    Running 10.10 the OS rejects any scaled resolutions exceeding the monitor's capabilities (at least for my graphics card, the AMD HD5750), which rules out the latter 2 options.

    Has anyone so far found a new way to create custom HiDPI resolutions in Yosemite?
  2. R2FX macrumors regular

    Mar 25, 2010
    have you enabled HiDPI mode in Terminal? :) I did try it on my unibody MBP 15" and it worked in a same way as in 10.9
  3. Bacci thread starter macrumors newbie

    Sep 11, 2012
    I did. The highest available HiDPI res for the iMac display is 1280x720, can't seem to find a way to run the iMac scaled to 1920x1080 but based on its native resolution (2560x1440).

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