The OP seems to have a good understanding of how 4K displays work. Sudo defaults write /Library/Preferences/ DisplayResolutionEnabled -bool false If you decide you want to revert the change above, just use this terminal command:
27 inch 4k monitor mac text size full#
UI Looks like: 1920x1080 (1080p FHD - Full High Definition) Resolution: 3840x2160 (2160p 4K UHD - Ultra High Definition) This is what I see (I connect to the TV via an A/V receiver):
Once you have found one that works for you, you can verify that you're getting the right resolution by clicking the Apple Menu in the top-left, selecting "About This Mac", then the "System Report" button, then clicking "Graphics/Displays" in the list on the left. You may have to experiment a bit to find the best one, but for me "1920x1080 HiDPI" enabled the native 3840x2160 resolution and scaled the interface up to look as if it were 1920x1080. You should see a number of new options, some of which will be marked "HiDPI". Hold the Option (alt) key and click the "Scaled" radio-button. Reboot the mini and open System Preferences -> Displays. Sudo defaults write /Library/Preferences/ DisplayResolutionEnabled -bool true
Enter this command as an administrator user, then type your password (the cursor won't move while typing. I don't know why that is, it is a 4K display after all, but the good news is that you can manually enable scaling using the terminal. The problem is that macOS isn't enabling HiDPI resolution scaling. I could select the native resolution, but the UI was unscaled and so everything was microscopic even on a 50" screen. I had the same issue with a new 2018 mini connected to a Sony 4K TV (native resolution 3840x2160).
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