Macbook Air M1: No 4K@60Hz possible on my 32" 4K BenQ EW3280U

Just had a call to Apple support. They know about this problem and working to fix it by some of next version of Mac OS. So all we have now - just wait.

I have 60Hz only on 2560x1440 resolution. But may be it works only cause I use SwitchResX app. I'm not sure.

Wish a patience for all of us.

ˆ..ˆ)))))>>>>>

I have a 4K display (Dell S3221QS).

Currently the following combination works well for me.

Output @4K 60hz.

Macbook Pro (16GB memory, 1TB)

- USB C Extension Cable (USB-C 3.1 Gen2 10Gbps)

- HyperDrive USB C Docking Station

- Displayport Cable

- Dell S3221QS

The MBP is powered by the HyperDrive.

Occasionally (a few times a day), the screen will turn black looking for the DP signal, but this is acceptable for practical use.

I hope this helps.

I believe macOS 11.1 broke some of the 4K resolutions and Apple had acknowledged the issue and promises a fix.

Amazon.

Cable Matters Short USB C to... https://www.amazon.com/dp/B06XTZZYKX?ref=ppx_pop_mob_ap_share

Correction.... after changing the resolution on the external display a few times 60Hz kicked in with dual display.... at least I have a work around for now...

I am using caldigit hdmi. It is running ok with resolution and frequency (60 hz)

The issue, in my opinion, is how the Air M1 sends the information to the monitor.

Wow you saved my butt after an hour search. M1 Macbook Air using AOC U2790VQ monitor hookup to HDMI port 1. Also you need the A2119 adapter to have 4k 60hz.

Everything is now working A1 for me using a BenQ EW3270U via usb-c with the latest BigSur 11.2 beta..

I just wish Apple had enough courage to admit when there stuff isn't working... 2 more days and I was returning the **** thing...

Crappy communication -> build different Apple ...

Hi,

I connect my MBP to the Dell display via the dock like this.

MBP --- <USB C cable male-female> --- HyperDrive --- <DP-DP cable> --- S3221QS

And Dell connects fine to MBP when waking up.

When directly connected, the screen goes intermittently black. The same as in your case.

I also tried this same combination with HDMI and the display did not wake up.

(And I got the same weird screen as in your second picture)

So far, DP looks better than HDMI for me.

Surprise Surprise.... Well not so much but...

Since my upgrade yesterday to Beta 11.3 (20E5186D) I still can't get 60Hz on my BenQ EW3270U working when the laptop monitor is opened :

but, when the laptop monitor is closed :

still useless for me since I use the laptop keyboard.. grrrr.

Has anyone called Dell's Tech Support and asked about this? Or called Apple's Tech Support?

M1 Macbook Air base model. 7 core GPU.

Big Sur 11.1

Dell s3221qs 4k monitor

Cable is USB-C to DisplayPort - unknown spec, but it works with a Windows laptop on this monitor, and a 2018 Macbook on a 1440p monitor if that means anything.

4k@60hz I got intermittent black screens and it's unusable.

4k@50hz works, but I lose HDR

Updating from Big Sur 11.0.1 to 11.1 fixed some 4k HDR stuttering on Youtube, but I still get a black screen every few seconds.

I have a MacBook Air M1 and Mac Mini M1 and both can connect to my LG 38WN95C-W ultra wide 3840 x 1600 at 144Hz via display port and USB-C. USB-C however, with MacOS 11.1, is crashing and restarts the Mac each time I wake it up while connecting to the display. On Display Port (USB-C to DisplayPort cable) it works great at 144Hz.

Yep I have the same problem. Does anybody know if the M1 MacBook Pro also can't display 4k properly? I can't understand that I can view my 55" TV at 4k 3840x2160@60Hz on windows 10 and not apple. Very disappointed :-(

Same here. MBP M1 connected to BenQ EW3280u, Big Sur 11.2 latest beta version (as of 22 January) installed on the laptop, and still 4K@30hz max over USB C, or 60hz but 1440p max. Come on Apple, it's a really aweful issue that affects a huge group of users, and renders 4K USB C monitors useless for M1 Mac users.