LG 27 UD 68 Monitor and MBP 2016

[foulmouthedleon]

OK, probably a stupid question here, but I got a LG 27UD68 monitor to go along with my 2016 MBP (no touch bar version). Got it hooked up, but it's displaying at 30hz and it's a bit choppy.

It's connected via the USB-C adapter and a high speed HDMI cable. I can't seem to get the option to change the refresh rate in Display.

Any ideas? I have to assume that this is possible via standard OS X controls and I won't need a third party app to make this work.

 

[Dave Braine]

It seems that the MBP only supports 30Hz. This may help you:
https://9to5mac.com/2016/06/04/how-to-enable-4k-60hz-resolution-2016-macbook/

 

[foulmouthedleon]

Yes, I saw that, but this is for the brand new MBP that came out last week. That appears to be the regular MacBook. I would assume that if the retina MBP 13" from 2015 did this, so too would this.

 

[foulmouthedleon]

Anyone on this? I find it very difficult to believe that a new late 2016 MacBook Pro and a new LG 4K monitor won't put out a 60hz signal. I'm stuck on 30hz...

 

[supermariofan25]

Is it possible that the USB C to HDMI adapter don't support HDMI 2.0? I know that HDMI 2.0 is required to support 4K at 60Hz. According to the monitor's manual. 4K 60hz is only supported when 'HDMI ULTRA HD Deep Colour' is turned on.

 

[cerberusss]

I think Supermariofan25 is correct...

It's connected via the USB-C adapter

To rule out misunderstandings, you mean Apple's own USB-C Digital AV Multiport Adapter?

In the overview on that page, it says: This adapter allows you to mirror your MacBook or MacBook Pro display to your HDMI-enabled TV or display in up to 1080p at 60Hz or UHD (3840 by 2160) at 30Hz.

Perhaps you need something like this one:
Accell USB-C to HDMI 2.0 Adapter
Quote: "The USB-C to HDMI 2.0 adapter supports HD resolutions of up to 4K @ 60Hz"