4k Resolution no longer works on mojave 10.14.6

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4k Resolution no longer works on mojave 10.14.6

I recently purchased a monitor (LG 27UL500-W ) that has a native resolution of 3840 x 2160.

Up until about a day ago, when I was forced to update to mojave 10.14.6, now my monitor is limited to 1920x1080, and there's no longer a list of resolutions to select from, simply "larger text, smaller text". This is bad ui, it's also very frustrating considering I spent a lot of money to be able to utilize a higher resolution.

Is there a way to force my own native resolution ? Or will this be fixed in some other release?

Posted on Aug 7, 2019 11:22 AM

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Answer 1

andrew_aech Author

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Aug 8, 2019 6:59 AM in response to Malcolm J. Rayfield

thanks that actually works, but still doesn't show my native resolution. However i'm using hdmi right now, i am going to try a display port tomorrow and see if I have any more luck, thinking I may be limited by that (although it wasn't a problem before the update)

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Answer 2

andrew_aech Author

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Aug 18, 2019 6:25 PM in response to Nunoparada

So I had been using an hdmi cable, this was limiting the amount of video bandwidth. I ended up grabbing a display port cable (display port to usb c in my case), and I was able to get a full 3840x2160 and a 60hz refresh, so windows were no longer laggy as well. After using that cable the full range of resolutions available (at a full 60hz) appeared again

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Answer 3

Aug 18, 2019 6:26 PM in response to andrew_aech

Thats for the response! I still don't get how this can happen after it was already working JUST FINE. Oh well. The app EASYRES works to.

I am looking to get the full 60hz. Is there a major difference from 30-60hz? What cable did you buy?

THanks!

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Answer 4

andrew_aech Author

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8 points

Aug 18, 2019 6:32 PM in response to Nunoparada

I know. My only guess is maybe even giving the option to display at a lower refresh rate maybe it degraded performance. I do wish however it was more apparent as to how to change that setting, I would've never thought to option click that area to open that menu, doesn't seem super intuitive.

Here's the cable I bought though:

https://www.amazon.com/gp/product/B075V27G2R/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

Oh, and the major difference between 30hz and 60hz is at 30hz you're going to have a more noticeably "laggy" desktop experience. HDMI simply doesn't support anything higher than 30hz. Displayport does.

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Answer 5

andrew_aech Author

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Aug 7, 2019 11:38 AM in response to andrew_aech

so I ended up using a free app called easyres to be able to select my native resolution again, and it's fine for now

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Answer 6

Aug 7, 2019 8:43 PM in response to andrew_aech

Option-clicking the Scaled button in Displays system preference should show all resolutions.

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Answer 7

Aug 18, 2019 5:01 PM in response to andrew_aech

I have the EXACT thing happen to me after 10.14.6 update. The easy Res app works but I feel that the OS should managed this. What did you do to remove it?

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4k Resolution no longer works on mojave 10.14.6

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