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I've got 2018 MacBook Pro 15" (Radeon Pro 560X), which I'm connecting to external LG 4K display (27UD69P-W) via Satechi Type-C to HDMI Adapter (says 4K/60hz on the box), but the display is running 30hz.

enter image description here

How do I make it do 60hz?

Thank you!

  • Weirdly enough, this person seems to have the exact same problem as you today: Unable to get 4K @ 60Hz resolution – jackgmarch Oct 17 '18 at 18:17
  • @jackgmarch ouch, that guy has DisplayPort, and I thought I can solve this by switching to DisplayPort from HDMI – Alexander Eliseyev Oct 18 '18 at 3:25
  • Have you checked if there's another port in the back of the display? One of my displays, too, refused to use 60Hz until I unplugged the Mac and used the other HDMI port. – 19h Apr 12 at 18:42

11 Answers 11

26

On my Philips 328P6V monitor, using a USB-C to DisplayPort cable with my MacBook Pro (15 inch model from 2019 with Radeon Pro 560X), I first was stuck at 4k@30Hz and couldn't get 4k@60Hz (even though the cable supports it). I had to do two things:

  1. Enable DisplayPort version 1.2 in the monitor's menu.
  2. Choose "Resolution: Default for display" in my Mac's System Preferences/Displays.

The first point is pretty obvious, given that DisplayPort 1.1 only supports 30Hz for 4k.

The second point, however, is a bit weird. The original setting was:

enter image description here

And this setting delivered 4k@30Hz. Choosing "Default for display" changed it to 60Hz. After that, even re-selecting "Scaled" keeps my monitor at 4k60Hz.

What I believe might have happened is, that when I had first connected the display, it was still set to DisplayPort 1.1, and I assume my Mac remembered this. Resetting SMC/PRAM didn't seem to help. Switching the Resolution selector in the System Preferences probably made macOS rescan the connection and remember the updated DisplayPort 1.2 capability.

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  • 3
    On my LG Ultra HD I got a menu message that said "To view the 4K@60Hz ... via connected devices go to [Picture]>[Picture Adjust]>[HDMI ULTRA HD Deep Color] and change the settings into On." I tried 3 different cables before discovering this! – JohnQ Apr 18 '19 at 1:59
  • This "HDMI Ultra HD Deep Color" setting bumped me up from 30 Hz to 60 Hz as well. Using a Pixelbook. – Kiran Jonnalagadda Jul 4 '19 at 18:27
  • Pure awesomeness! – Jim Aho Oct 16 '19 at 6:40
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    Quickly switching to "Default for display" really does fix the issue! Thanks! – Robert Metzger Mar 6 at 10:41
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    For me, I clicked “scaled” while holding the option key, then clicked on a checkbox called “show scaled resolutions”. Then, the refresh rate was selectable. – sleepy_keita May 16 at 23:58
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I had the same issue on my MacBook Pro 16". You need to option+click on scaled in display settings and then select 4k resolution. Then tick the box that says "show low resolution modes" and then change the refresh rate to 60hz. Solution found/problem solved.

If this doesn't work its your adapter or cable that is the issue.

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    I cant select 60hz I only get 30/25/24 – ALM Jun 11 at 0:19
  • Thanks - it works like a charm, you've made my day! – cyberz Jul 1 at 9:47
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So I've tried a few things:

  • IOKit/CoreDisplay patch described in this article. But the patch doesn't cover AMD graphics card and is not compatible with the CodeDisplay version I have
  • Randomly re-connecting the USB-C/HDMI cable (I've seen comments claiming it works sometimes)
  • SwitchResX. It has weird UI, but it works! My display is now recognised as "SwitchResX4 LG Whatever" and does in fact run 60hz. It's not free, but I haven't found a better solution yet.

SwitchResX4 LG Whatever

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3

For me it was an HDMI cable issue as Bunches answered. I used the one that came with my gaming monitor and it started working. So her answer is indeed helpful, nobody else mentioned trying another HDMI cable. Unfortunately i dont have points to give you an upvote yet.

I would love to know which exact spec was a mis-match but both cables have similar labelling: -

Premium Hight Speed HDMI cable with ethernet AWM style 20276 80C 30V VW-1

The only difference is the model number:

E358026 - not working.

E474198-C - working.

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I’ve had better luck using USB-C to DisplayPort with macOS to achieve 4K@60hz. Something with HDMI 2.0 was a bit of a tweak to that standard. Even using Win10 I had to specifically go into the NVidia settings and tell it to use the UHD profile to achieve 60hz over HDMI 2.0. I imagine SwitchResX is giving you that capability.

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  • Amazing, this fixed my issue! Thanks! – user3127576 May 22 at 18:06
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Hardware:

  • MacBook Pro 15" 2018
  • Monitor 4k 28" Samsung U28E590
  • Cable usb-c to HDMI (Supports @60 HZ)

** I have also a dock hub dual usb-c port with outputs ports one of them HDMI and also 2 usb-c output ports.

This issue happen to me on any combination, using my dock hub or directly connecting the cable to one of the MacBook ports, I use 2 monitors this samsung 4k and the other 22" DELL FHD, also it doesn't matters if I use just the samsung monitor or both, but by default connecting the usb-c/HDMI cable to the monitor doesn't recognize the @60hz and sometimes neither all the capable resolutions it's really annoying struggle on this on a recent Macbook Pro, so when this happens I used to disconnect the cable from the usb-c on my MacBook then connect it again and finally switch the HDMI ports on the monitor and backing it up again to the correct HDMI port with the 60hz capability, THEN the resolutions are selectable and also the 60hz option to all the resolutions.

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0

I have had the same problem with that exact cable (Satechi) and a 4k TV. There is a problem with those active adapters & cables on the MacBook Pro 2017 & 2018 models. Please check your "USB" category on System Profiler, does it state that the cable is connected as "BILLBOARD 2.0" under the USB 3.0 category? For me it seems that we can't activate the "DP Alt Mode" on these thunderbolt ports (for no apparent reason). And that's why you are getting 30hz.

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I simply swapped out my cable with a thicker HDMI cable and it did the trick.

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  • What was the earlier cable type? Also, is that all you can really add to the answer? Such one liners are normally frowned upon by the community. See How to Answer – anki Sep 19 '19 at 18:42
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I have had this problem.

Mine is : MacBook Pro (13-inch, 2018, Four Thunderbolt 3 Ports)

Bear in mind that MBP 2016-2018 models do not support 4k 60Hz in the right usb-c ports.

You should definitely check with the left ports (usually people use right ports)

And also you need to check the cables.

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  • MBP has no 18" versions, a 17" version has not been produced after 2011, and the 16" version started coming out only by late 2019 vs the OP stating that it is dealing with a 2018 MBP. Pls revise your answer. – Alper Mar 9 at 3:15
  • Sorry I meant 2016-2018 models. Didn't mean the size of screens. – Tae Jin Park Mar 10 at 5:27
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On Hisense, I had to open the TV settings and Select Enhanced HDMI output, and then disconnect reconnect my HDMI cable. I also had to switch from extended displays, back to mirror, and then back to extend.

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In my case, one day "Default for display" workaround stopped working.

After reseting NVRAM, workaround started working as usual.

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