Problem with external display 4k@60hz on macOs Mojave

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Problem with external display 4k@60hz on macOs Mojave

I'm experiencing a problem with my external display which is 4k LG display.

I'm using MacBook Pro (15-inch, 2017), Processor: 2.8 GHz Intel Core, Memory: 16 GB 2133 MHz LPDDR3, Graphics: Intel HD Graphics 630 1536 MB

To connect to the external display I'm using USB-C to HDM dongle from Belkin.

When playing with the settings I managed to get it working at 1920 x 1080 60hz for resolutions larger than that I get only 30hz non retina.

Example on what I'm getting when trying to use it at 60hz

MacBook Pro (15-inch, 2017), macOS Mojave (10.14)

Posted on Sep 24, 2018 11:39 PM

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Answer 1

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leroydouglas

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183,720 points

Sep 25, 2018 8:44 AM in response to lbudakov

Get help with video issues on external displays connected to your Mac - Apple Support https://support.apple.com/en-us/HT201177

Identify the ports on your Mac - Apple Support https://support.apple.com/en-us/HT201736

Adapters for the Thunderbolt 3 (USB-C) or USB-C port on your Mac - Apple Support https://support.apple.com/en-us/HT207443

Using 4K displays, 5K displays, and Ultra HD TVs with your Mac - Apple Support https://support.apple.com/en-us/HT206587

https://www.apple.com/shop/product/MJ1M2AM/A/usb-c-to-usb-adapter?fnode=8b

https://www.apple.com/shop/product/MMEL2AM/A/thunderbolt-3-usb-c-to-thunderbolt- 2-adapter?fnode=8b

https://www.apple.com/shop/product/MJ1K2AM/A/usb-c-digital-av-multiport-adapter

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Answer 2

Sep 25, 2018 1:57 AM in response to lbudakov

You should write an email to Belkin, because it seems their adapters are not optimised for Mojave. I have an adapter from Delock USB-C to DVI 4K30hz and it's only showing a green monochromatic picture. Delock answered me saying their products do not work on Mojave (yet?). No idea from which side the solution may come. Apple with a future update of Mojave or the adapter companies with some kind of firmware update for their products. We'll have to wait it out, I guess.

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Answer 3

lbudakov Author

Level 1

10 points

Sep 25, 2018 3:11 AM in response to INvisibleART

Thank you for your input. You are right, I guess we will have to wait ... I will write to Belkin so they are aware ( if they are not already ) but in the mean time. I went out and bought UCB-C to DisplayPort and now I'm able to use my monitor without a problem.

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Problem with external display 4k@60hz on macOs Mojave

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