Good afrernoon!

I've bought a new monitor and I'm having some troubles at setting it's resolution/scaling factor.

First of all, I don't have the option to set text scaling as some tutorials make reference to (https://macreports.com/how-to-change-the-text-size-in-macos/)

Then, I'm having some trouble at choosing a sharp resolution for it. The only ones that "work" are 1080p HiDPI, 1440p and 2160p. But the first one makes everything huge, the second one looks awful and the third one makes everything tiny.

I've tested a few apps, like SwitchResX or RDM, but neither of them have worked.

P.D.: My new monitor is a LG 27UL550W and my Mac is currently using macOS High Sierra.

Thank you!

  • 1
    Have you tried the other resolutions in the Display Preferences pane by Option-clicking the "Scaled" radio button to show additional resolutions?
    – agarza
    Commented Dec 20, 2021 at 20:12
  • Can I assume you meant LG 27UL550W when you entered LG 27UW550? What screen size does the Mac have? Are you using HDMI or DisplayPort on the monitor? Commented Dec 20, 2021 at 23:15
  • @agarza. I've tried using the "shorcut" to display other resolutions but the options shown are even worse. Commented Dec 21, 2021 at 6:48
  • @David Anderson Yes, I mispelled the model in the title. I've just changed ;) Commented Dec 21, 2021 at 6:50
  • Ivan: OK, but what about the other questions I asked: What screen size does the Mac have? Are you using HDMI or DisplayPort on the monitor? Commented Dec 21, 2021 at 7:31

1 Answer 1


The three resolutions you have tried are the three highest resolutions the display is capable of. There are no other resolutions you can achieve that are between these resolutions. The rest of this answer documents (supports) what I have already stated.

Below is a table showing the horizontal and vertical pixels associated with the resolutions given in your question. This table was derived from the following webpages.

ViewSonic: What Is Monitor Resolution? Resolutions and Aspect Ratios Explained
Wikipedia: 4K resolution

Resolution Pixels
1080p 1920 x 1080
1440p 2560 x 1440
2160p 3840 x 2160

Below are tables taken from the LG 27UL550 owner's manual

DisplayPort HDMI HDMI Timing


  • I completely understand that my monitor only has those resolutions, but what I'm looking is something like fractional scaling, like Windows or some Linux distros have. But my monitor, not being "retina" doesn't allow me to set scaling as I was expecting when I linked that tutorial on the post. Commented Dec 21, 2021 at 6:53

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