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display – How to get full resolution for LG 27UK650-W with MacBook Pro?

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I had also issues with setting up MacBook Pro 16″ (2019) and LG 27UL650-W. Did all kinds of tricks from this post.

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Be aware that most USB-C Hubs with HDMI, will send max 30Hz signals. With my USB-C hub, it got 4K at 30Hz max. I tried USB-C to DisplayPort-cable. Still got only 30Hz out of it, but with max 1080p resolution. Windows 10 Laptop with the same cable easily went up to 4K 60Hz.

Finally, one solution worked for me: setting in the LG Display the DP version from 1.4 to 1.2. Now I have a full scale of resolutions:

System Reports shows
LG HDR 4K:
Resolution: 3840 x 2160 (2160p/4K UHD 1 – Ultra High Definition)
Looks like: 3840 x 2160 @ 60.00Hz

When setting it to lower scaled resolutions than 4K (midsize), in System Reports, I read:
LG HDR 4K:
Resolution: 6016 x 3384
Looks like: 3008 x 1692 @ 60.00Hz

Hope this will help you too.

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