10.13 not doing Retina correctly on external display

Mike Richardson

macrumors member
Original poster
The display is an Acer S277HK connected to a MacPro5,1 with the Radeon HD 5770 card.

On 10.12 and even 10.9, I can get the correct Retina mode to work: 3840x2160 that "UI Looks Like 1920x1080".

I finally installed 10.13 today and if I do "Default for display", I get 3840x2160 but everything is tiny and impossible to read. It's using the full resolution of the display, but it's not making it "UI Looks Like 1920x1080".

So for now I have to run it at "1080p" which is just regular non-Retina 1080p where it's blurry and not very good, but at least I can read the text.

(Radeon HD 5770 supports the Retina mode I want. I have used it before. The only limitation is that it will run at 30 Hz.)
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Tried this in the terminal and it failed to help.

sudo defaults write /Library/Preferences/com.apple.windowserver.plist DisplayResolutionEnabled -bool true
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Test. Apparently, editing a post with an attachment fails. You have to make a new post that then gets merged.

Anyway here you can see how Default for Display is a failure, everything is just stupidly small.


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