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Alfredmm1 Author

Level 1

22 points

M1 Macbook air external display issues with usb-c

My M1 MacBook air is having issue when connecting to my 4k Asus pa279cv display over usb-c to usb-c cable directly to the usb-c DisplayPort, but it is okay when connecting to HDMI port with usb-c hub.

The monitor supports 65w and DisplayPort 1.2 and it should be fine as I tested it with with 2016 MacBook Pro 13" and 2020 Intel MacBook air.

So I start to guess it would be the m1 issue and I reserved Genius Bar to fix my computer.

However it just fine when plugin to the LG 5k Display in the apple store.

After that, I tested it again at home.

I notice that it pops up a message "Unplug the accessory using too much power to re-enable USB devices", but my monitor is charging up the Mac properly.

Lastly, I found that it is occasionally work with the usb-c to usb-c cable to the monitor.

And it could not connect again when the the Mac disconnected with the monitor.

I am frustrated with the situation, and my Mac just arrived serval days.

MacBook Air

Posted on Dec 4, 2020 7:07 AM

Top-ranking reply

hotinyip

Level 1

9 points

Posted on Dec 12, 2020 1:24 AM

Exactly the same situation with you, and probably I could help you.

I just bought a brand new m1 MacBook Air and Asus PA279CV. At first, I found the same issue with you in which when I plugged in the usb-c cable to the MacBook, the monitor showed nothing, but it could charge my MacBook. Then I found that, if you shut down your MacBook, then plug in the usb-C cable, then open you MacBook, and you will find the monitor works properly (showing the visual and charging your MacBook at the same time). I don't know why it has to close the MacBook first before plugging in the cable (it is quite not convenient when you are working and want to plug in the cable to continue your job at external monitor), but it is the solution that I can find at this moment.

Hope it helps.

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66 replies

grandtom

Level 1

12 points

Dec 27, 2020 11:56 PM in response to Alfredmm1

There are issues with usb-c cable: it doesn't work at all !! No signal !

Alfredmm1 Author

Level 1

22 points

Dec 28, 2020 12:09 AM in response to grandtom

You may try to connect the monitor with usb-c cable and then restart it. It works for some of us but that is not a long term solution.

grandtom

Level 1

12 points

Dec 28, 2020 12:18 AM in response to Alfredmm1

It just worked just now by simply plugging the usb-c: it's really too random !

Alfredmm1 Author

Level 1

22 points

Jan 26, 2021 8:32 PM in response to ptarlos

Everyone come form different issues, sigh

ptarlos

Level 1

4 points

Jan 27, 2021 5:56 AM in response to Alfredmm1

Yeah ... feels like we're the beta testers for this M1 hardware. In time Apple will catch up with it's software.

RiCKSMAD

Level 1

4 points

Jan 29, 2021 5:56 AM in response to Alfredmm1

Same issue here.

Brand new MacBook Air M1 8GB RAM, when connected with Samsung C34J791 Ultrawide 34" via usb-c the display is significantly laggier.

Sometimes I have to restart the laptop.

Alfredmm1 Author

Level 1

22 points

Feb 3, 2021 4:44 AM in response to Alfredmm1

Is there is anyone can solve the issues after updating to 11.2?

My issues still not be solved

MrDindon

Level 1

8 points

Feb 3, 2021 4:51 AM in response to Alfredmm1

It was working A1 for me with previous beta and went back to 30hz with this morning 11.2 update. Apple, we are not beta testers... We paid the big price... Fix it !!

Chrizard

Level 1

4 points

Feb 3, 2021 4:54 AM in response to Alfredmm1

Nope, same as before for me. 11.2 did nothing.

Feb 3, 2021 5:17 AM in response to Alfredmm1

Same issue

RiCKSMAD

Level 1

4 points

Feb 3, 2021 5:21 AM in response to sparrowhawk360

Same issue on 11.2

ptarlos

Level 1

4 points

Feb 3, 2021 6:03 AM in response to Chrizard

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.

mlierley

Level 1

8 points

Mar 1, 2021 9:14 PM in response to Alfredmm1

I an having a similar issue though mine will work great for hours and then just loose signal like I unplugged it. 15-20 second later it will reconnect and go on like nothing happened.

mlierley

Level 1

8 points

Mar 1, 2021 9:16 PM in response to ptarlos

I have 2 docs, 1 is connecting to the external monitor via HDMI (Buggy and looses signal often), the other is VGA without issue. This is a mess.

Mar 17, 2021 6:44 AM in response to Henk Smets

Everything has been working for me for the past few weeks. Got a new headset. I think it was likely the headset cable all along and not the USB-C port that was the problem.

M1 Macbook air external display issues with usb-c