External display no longer working since software update

Question

External display no longer working since software update

MacBook Air (M1, 2020)

Monterey Version 12.5

Completed the most recent system update and now am no longer able to use my Samsung external monitor. Since the update, the System Preferences no longer allows you to turn on and off the external monitor extended display settings, so I can tell the update involved this particular preference. Though my MacBook must be aware of the monitor (as it is opening windows on the extended display,) the display is not reading any signal through the HDMI port and cable.

MacBook Air Apple Silicon

Posted on Aug 1, 2022 7:59 AM

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Answer 1

Aug 1, 2022 8:48 AM in response to Dale Richards1

Thank you, this should work without any third party software.

Did you try turning the display off and back on?

Can you explain what you mean by "System Preferences no longer allows you to turn on and off the external monitor extended display settings"?

When you start System Preferences->Displays, does it show one or two displays?

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Answer 2

Aug 1, 2022 8:52 AM in response to Luis Sequeira1

Sorry, to clarify: It would not allow one to "Stop Mirroring." There was no option to select that. Yes. the other monitor was showing up (like the example above) as an option, but would remain black when trying to extend the display.

I was able to get it set up in the interim though. I had to select screen mirroring, then toggle stop mirroring, then select it again, then set up my Macbook Air as the main screen and then the Samsung as the extended screen. That did the trick.

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Answer 3

Aug 1, 2022 9:01 AM in response to Dale Richards1

I am glad that you got it working.

FWIW, there is a very useful shortcut that you may or may not be aware of: Command-F1. This toggles mirrroring on and off without even having to open System Preferences.

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Answer 4

Aug 1, 2022 8:11 AM in response to Dale Richards1

What adapter are you using to connect the display?

If it one of those that require Displaylink software, you may have to update that.

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Answer 5

Aug 1, 2022 8:32 AM in response to Luis Sequeira1

MOKin USBc to HDMI/USBc/USB connector. It worked fine previously, and I did not need to use any third party software previously either. Does that make a difference?

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External display no longer working since software update

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