M1 Air + External LG ultrawide. No signal after random time.

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M1 Air + External LG ultrawide. No signal after random time.

I've a new LG Ultrawide 49"

Macbook Air M1

USB-C cable (as supplied by LG) connected to MacBook for power/display.

After waking my MacBook I am able to use it for a short space of time before suddenly the external monitor goes blank and I see the message "No signal. Entering energy saving mode shortly" - and then it does.

Sometimes I cannot wake the monitor again and have to unplug the USB, wait a moment and then plug it back in. Sometimes this doesn't work and I have to use the second USB C port, and if that fails then I have to open the MacBook before plugging in the monitor again.

Is there any fix for this? It's driving me up the wall. I suspect it's likely a USB PD issue, but the MacBook doesn't seem to be helping at all.

Any ideas?

Thank you.

MacBook Air (M1, 2020)

Posted on May 18, 2023 6:00 AM

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Answer 1

Jul 4, 2023 5:24 AM in response to Sparky2104

Ventura - External Displays not working - Apple Community. Ventura Lg is my problem too. I get nothing. Its all black all the time. Maybe I try this one I found here. But must be in admin mode for terminal to use.

HI, in case you're getting the issue of the garbled external display in macOS Ventura I just found a temporary solution:

Sign in the macbook without the USB type-C attached
Open Terminal and Type:

sudo sleep 20 ; sudo kill -9 $(pgrep WindowServer)

Type your password
Connect your USB Type-C
At this moment both of your screens might get garbled but don't worry as the command above will run in 20 seconds, after that the process will restart and hopefully after that your external monitor should be working by now.
By default the resolution should be defaulted to 3200*900 but you can updated the settings, I'm now running at 5120* 1440 without any issues.
If you restart your mac you need to run the command again.

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Answer 2

Jul 4, 2023 5:27 AM in response to kalervo145

Did you find any help to your problem.

I just bought LG 24 4K and nothing is working.

Apple service can not find solution.

I reinstalled Ventura but no help.

So i am thinking about going back to Big Sur if I find no solution.

I need to see bigger. Thats it.

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M1 Air + External LG ultrawide. No signal after random time.

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