M1 Macbook air external display issues with usb-c

I'm also struggling with USB-C monitors and M1 macs. I have both a Mac mini M1 and a MacBok Air M1 and it seems there are USB compatibility issues overall with these M1 macs.

All my DELL USB-C monitors's (4 different models) built in USB-hubs will not work over USB-C until I unplug and plug the USB-C cable back in 1-3 times. Once it works it works even if I put the computers to sleep. But as soon as I reboot or disconnect the USB-C able I have to unplug and plug the cable back in 1-3 times for any USB-hub to be recognized.

I really hope Apple can fix this with software updates in the future.

Exactly same problem with Acer PE270K when connected via USB-C.

The M1 Macbook Air crashes a short time after entering sleep mode.

I have temporary changed de preferences for the M1 never to go to sleep under power.

Another issue is that the monitor itself has a USB hub, and with a Time Machine HD connected to it, when the computer goes to sleep, the disk is incorrectly ejected.

This needs some attention from Apple, since I think that my set up is quite common: use the Air as standalone for travel, and connected to a USB C monitor/hub on the desk.

Hi and thanks for taking time to post this.

I just purchased the ASUS PA279CV too and am having USB-C issues too.

Initially I found that the USB-C cable (supplied and my own) would not charge my Macbook.

To test if the cable worked at all, I connected one end to the Macbook and the other end to a USB-C phone (not the monitor). Happily, the phone started to charge so I could confirm the lead was not faulty.

Only after this, could I get my M1 MacbookPro to charge from the ASUS PA279CV.

However, I could not get a video signal from My M1 to the PA279CV regardless of what I tried. HDMI worked fine BTW.

At one stage I had an alert on the Macbook telling me a USB device was drawing down signficant power.

I'm going to try a few things over the weekend. Overall, very impressed with the ASUS monitor but this seems a let down. Unsure if the issue is with Asus or Apple.

I'll have a spare Macbook Pro (15") next week and will see if that makes any difference.

Also had problems connecting my new 2020 MacBook Air M1 to an external monitor. I used an HDMI to usb-c cable to connect to my Dell monitor. The monitor did not receive any signal. When I plugged in the usb-c cable, the Mac froze for a few seconds and displayed nothing on the external monitor. I tried shutting and opening the lid, and restarting the Mac, but nothing worked. My wife's 2019 MacBook Air (Intel model) worked perfectly with the same cable and monitor.

My solution ... I bought a Belkin usb-c to VGA adapter (sold by Apple) and used a VGA cable to my monitor. It worked perfectly! Looks like M1 still has major issues with HDMI.

Yes I did. I tried both cables, the original LG USB-C cable and also the Apple original USB-C/Thunderbold3 one. Same behaviour.

Also nothing changed by changing Resolution or scaling down from 4K to 2k by 60 Hertz.

The monitor (LG 32UN88a) is working fine with my Windows 10 Laptop over USB-C, so I think the issue is with the Apple M1 Chip.

I have a similar issue with my MacBook Air M1's usb-c. I use a Plantronics external dock and headset for work and the USB for the dock plugs into an apple usb-c adapter and is sometimes recognized, with no rhyme or reason as to why. What's quite strange is I also have a Belkin adapter working with no issues at all so far plugged into the other usb-c port for my ethernet hookup. Both adapters and corresponding units work perfectly with my Dell laptop and my old Mac's thunderbolt ports and corresponding adapters. Very strange. I've tried all the shut down/sleep mode/plug in/plug out "fixes" and none of them are working for me. Once the Apple stores open back up here on the west coast I'll be returning this Mac unless I can find a fix that works reliably. Very very frustrating.

MACBOOK M1 HAS BEEN AWESOME WHEN CONNECTED TO USB – C HUB

This news appeared since December on the forums of Apple users, especially those using the M1 series. With this report, the MacBook M1 encountered a very puzzling shutdown error when connected to USB Type - C Power Delivery.

What happened to the MacBook M1 and USB Type-C Power Delivery?

The initial symptom of this error is that the MacBook M1 cannot power on even though the battery is full. Besides, some users have heard sounds like clicking or typing on the keyboard. This behavior occurs when the power cable is plugged in or out, or when the MacBook M1 is in sleep mode with the hub connected.

At the time of the above incident, all MacBook users could do was just return the MacBook M1 to the company for repair or buy a new MacBook.

Apple will have a new update

[Link Edited by Moderator]

As I mentioned earlier, use usb-c to VGA cable, or VGA adapter to connect your monitor. VGA worked great for me on my Macbook Air M1. Usb-c to HDMI did NOT work.

When connected via USB C, is the Asus pa279cv supporting 10bit color and HDR? Do you find additional lag compared to other connections?

I have some issues with USB-C displays as well. I have a BenQ EW2780U that worked flawlessly with my 2018 MBP, but after using the M1 air, I've noticed that the display is significantly laggier (specifically the mouse movements) than before. Not entirely sure what's going on. Also noticed that the Air's normal display behaves weirdly when Night Shift is on, and changes the colours into a bizarre shade, almost as if its a "colour-blind" setting... also something that didn't occur on older MBP.

Serious issues with LG 32UL950-W and and sleep for M1 macbook air (updated with latest OS- 11.1), connected directly via Thunderbolt cable. Crashes the computer after sleeping for a short period. Mac will reboot and may sit awake (with monitor also on), awaiting login when you return. Unplugging and replugging Thunderbolt cable seems to be required after reboot/login to re-establish connection between laptop and monitor. Once connected, works beautifully (3840 x 2160 / 60Hz) until next sleep.

I have a similar problem. I found this page via MacRumors.

My M1 MacBook Pro 13" is plugged into a Dell 24" HD monitor via HDMI.

The M1 didn't detect it the first day. The next day, when I woke it up, it was working, but ever since then it's not consistent.

I disabled the "Prevent computer from sleeping..." setting and that helped some but after restart, the monitor wasn't detected again. So I put it to sleep and woke it up a few times until it began working.

This is frustrating.