Level 1

23 points

External Display USB-c Monitor issue

I have a MacBook Air M1 (base model) and a LG 27QN880-B 27” QHD connected via USB-c. I keep my MacBook Air open because I use it as a Secondary screen and the LG (primary).

The issue (2) is that when I wake up the MacBook Air from sleep the monitor doesn't turn on. I have to unplug and plug again the USBc to turn on (sometimes I have to do it multiple times). Second issue, the performance seems to be a bit choppy and sometimes laggy (cursor seems to skip sometimes) with the external display connected.

This used to not happen before (MacBook Pro Intel Mid-2018), I would imagine with the M1, things would run smoother... but it's otherwise.. worries me a bit...

To let you know, I used "time machine" and restored my MacBook Air from the MacBook Pro content would this also cause issues as I'm seeing?

Thank you All!

MacBook Air 13″, macOS 11.0

Posted on Nov 22, 2020 6:43 AM

Top-ranking reply

Kimochero Author

Level 1

23 points

Posted on Jan 15, 2021 12:04 PM

Update: I exchanged my MacBook Air M1 for a new one... after all the troubleshooting and no solution.

No more issues with the external monitor anymore upon waking up the MacBook Air.

I am running BigSur 11.1

BUT I still have mouse issues.. with the mouse cursor skipping around sometimes.. I have a Logi MX Anywhere 3 (changed from the MX anywhere 2). I now use the wireless dongle and no issues.. It saddens that I cannot use bluetooth mouse.. :(

View in context

Similar questions

133 replies

Nov 24, 2020 4:19 PM in response to alan7467

I did. I've written about my result above.

Nov 25, 2020 1:09 AM in response to sfilimonov

Do you think guys that the problem is affecting M1 Macs only?

I am now using a MacBookAir early 2020 running BigSur connected to a USB-C monitor with no problems.

Nov 25, 2020 4:05 AM in response to Ferruccio Giametta1

Which version of Big Sur are you using?

Nov 27, 2020 12:42 AM in response to Bazikg

I don't have such options even with Option key pressed with my LG27UL550 working in 4K@30 instead of @60 because of Big Sur. Apple support didn't help me. Their best advice was to wait for an update.

il-kon

Level 1

10 points

Dec 1, 2020 12:44 PM in response to Kimochero

I have exactly the same issue but my MacBook Pro 15 is 2017.

Before Big Sur it worked perfected 😩

il-kon

Level 1

10 points

Dec 1, 2020 12:46 PM in response to Ferruccio Giametta1

No, my MacBook Pro is 2017

Dec 15, 2020 8:12 AM in response to Kimochero

Its a complete joke! Apple needs to sort to out... I've lost an entire day trying to get my new LG screens properly... jittery, no shows, its ******* redicxulouis!!!!

Dec 16, 2020 3:07 AM in response to Kimochero

This video has helped me access the now hidden refresh rate settings in 11.1 but I am still unable to set 60hz at 2K res on my display: https://www.youtube.com/watch?v=2bJTf8TBGC0

Dec 18, 2020 8:04 PM in response to snoop088

Yep well put!

Dec 18, 2020 8:04 PM in response to snoop088

It’s a joke!

Dec 19, 2020 8:25 AM in response to snoop088

Try this solution https://apple.stackexchange.com/questions/336725/external-display-works-on-30hz

Dec 21, 2020 3:15 PM in response to Kimochero

M1 Air with Dell 27' Ultrasharp U2719DC connected via USB-C. It is not recognized after sleep in 11.1 very irritating. Only solution is to unplug and replug it back in.

Dec 29, 2020 12:20 AM in response to Kimochero

Can someone confirm that it's fixed in macOS 11.2? I'm still on 11.0 and not going to upgrade until this is fixed.

Jan 9, 2021 4:00 AM in response to Kimochero

Can someone confirm that it's fixed in macOS 11.2? I'm still on 11.0 and not going to upgrade until this is fixed.

Jan 9, 2021 4:38 AM in response to sfilimonov

There is no 11.2 yet... its beyond... I'm working on a machine & screens that feel like the 90's! Big Sur, more like Big Slur!

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

External Display USB-c Monitor issue