Restart the Mac in Recovery Mode (hold down Cmd-R once the Apple logo appears).This should only be done by advanced users and/or those who know what they’re doing because it involves disabling Apple’s System Integrity Protection for a short time.
WINDOW TIDY NOT WORKING UNDER MOJAVE PATCH
These are the steps to run that patch script and get a display override file in the right place on macOS Mojave. You can read through the forum post for details and check this this patch-edid patch for a Ruby script to make it pretty easy. The fix is to create a display EDID profile to force macOS to use RGB mode. The problem can be solved by overriding the EDID data of the display in order to tell OS X that the display only supports RGB. The reason is that the DisplayPort uses YCbCr colors instead of RGB to drive the display, which limits the range of colors and apparently causes the display to apply some undesired post processing. Many Dell monitors (e.g., U2713H, U2713HM, …) look really bad when connected to a Mac (OS X 10.8.2) via DisplayPort, as if some sharpening or contrast enhancement was applied. The canonical article I found is on the forums where the problem and solution (paraphrased) is summarized as: These are my notes for fixing the issue with links to the original sources. This weekend I finally upgraded my system to macOS Mojave (10.14) and this morning in the office my favorite display bug had once again returned. Instead it’s more like the screen is running at a much lower than native resolution. This problem with Dell monitors isn’t quite the “fuzzy font” problem you’ll see if you search around (that’s mostly referring to font smoothing or anti-aliasing adjustments which macOS can apply). One of the things I’ve always struggled with in this combination is really poor resolution when the Dell is connected. I’m lucky to have a work-provided MacBook Pro as my primary system along with a pretty nice Dell UltraSharp 30-in monitor at the office.
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