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

Found a way to fix this for the time being. Connected the monitor via HDMI, click displays - instead of the scaled option click Default for display. This then refreshed the screen into 60hz, then go back into scaled and select which one suits best.

Really weird glitch but this works for the time being (if it resets just do this again) until they patch it.

Did you select default for this display and then click scaled again?

I talked to Apple support for more than two hours with no solution. All my issues have been forwarded to the tech team. Apparently, Apple is aware of the issues. I was told they will be fixed with the next release of Big Sur. I am not entirely sure if these issues are Big Sur related or M1 chip. Perhaps a combination. At this point, there's nothing to be done other than waiting. Fingers crossed the update will come soon and address the issue.

I am also experiencing something new since my original post. Out of the blue, the screen saver kicks in even though it is disabled and I cannot turn it off. The only way to unstick is to restart the laptop.

After three updates since you posted, similar problems still not fixed by Apple :)))

My monitor is BenQ PD-2720U. I tired thunderbolt 3, td3 -> dp, hdmi with adapter and naive Apple adapter. And only hdmi with naive Apple adapter output with 4K 60hz. The rest of them only output 30hz. However some issues (for example, resizing weirdly, abnormal colour which is similar to someone posted after awakening laptop) when I used hdmi. When I tried to test on my iMac 2019, all worked with 4K 60hz.

I tried to use switchRes etc., doesn’t work.

I read some comments about using dp1.2 instead of dp 1.4, doesn’t work.

I contacted with Apple support. They asked me to reinstall system. Considering possible conflicts from my configuration, I even erased all data. Didn’t work...

M1 compatibility is such a nightmare for me. I can compromise of using single external monitor ( I have to use sidecar on iPad and link iPad to second monitor) but I can’t tolerate 30hz αt all. I have send upon issues to Apple team and hope they can solve ASAP...

I have the same problem. Macbook Pro M1, Benq EW3280. Tried to connect the laptop to the monitor via USB C cable (the one that came with the monitor), and laptop was being charged, and got image on the monitor, but at 4K resolution I had only 30hz, no option to switch to 60hz. When I switched to 1440p low res mode, I can switch to 30hz, but I didn't buy this monitor to use it at sub-4k. Connecting the laptop and the monitor via USB C-HDMI, I can use the monitor at 4k@60hz, but it's not ideal, because I have to use both USB if I want to charge the laptop while connected to the monitor. I really hope that this is a software issue and it will be fixed.

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...

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.