I am facing a really perplexing issue where I am unable to use the same settings on two identical monitors.

The Setup:

  • 2016 MacBook Pro 15" on OS 10.12.6
  • Two Asus PB287Q 4K displays
  • Both connected using USB-C -> DisplayPort cables
  • One monitor is vertical and the other is horizontal
    • Rotating so both or horizontal does not change the options available

As you can see from the image below, despite everything being the same (as far as I can tell), I am able to use scaled HiDPI settings on the 2nd monitor but not the first.

Would anyone know what could cause this? Or better yet, what can be done so that I can use scaled HiDPI settings on both monitors?

Identical Monitors, Different HiDPI Settings

Notes / Links:

  • I have seen this article about how maybe it's a software bug, but that wouldn't explain why it works on the second monitor and not on the first
  • I have tried installing Additional Tools for Xcode 9 to enable HiDPI in the quartz settings, but wasn't sure how to get to the new tools.
  • I have tried running the terminal command 'sudo defaults write /Library/Preferences/com.apple.windowserver.plist DisplayResolutionEnabled -bool true' but even after logging out and back in again I couldn't see any changes in the options presented to me.
  • Lastly, I can hold the option key when selecting scaling and pick the 'low resolution' 1440 x 2560 resolution, but what is displayed is not HiDPI and therefore highly pixelated.
  • Slightly kludgy solution given everything should just work out of the box for you, but what about using SwitchResX? – JMY1000 Dec 18 '17 at 5:59
  • A dumb thing to try: are you plugging them into opposite sides? – JMY1000 Dec 18 '17 at 6:19
  • Maybe just like Highlander there can be only one.... – Joonas Dec 18 '17 at 9:45
  • @JMY1000 Thank you for your response. I have tried plugging them both in on the left, or both in on the right side. I have not tried one on left and one on right. I will try this when I return to my desk and report the results. – Krejko Dec 26 '17 at 17:11

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