External Display doesnt work with M3 MacBook Air

Question

Psy_Psy Author

Level 1

5 points

External Display doesnt work with M3 MacBook Air

Hi there,

i´ve got recently a MacBook Air M3 (Sonoma 14.5)

In my homesetup my Display doesnt get recognised at all.

The display is a Philips 346B1C 3440x1440 60Hz. It has a USB-C which is USB-C 3.2 Gen 1 (PD 90 W).

The Display worked pretty well with a MacBook Air M2 and a MacBook Pro M1.

Just plug in the USB-C and get a Display. PD and a KVM (Mouse, Keyboard).

But with the M3 there isnt anything. Like there isnt anything plugged in.

Ive seen articles with similar problems but with Sonoma 14.1 . In Sonoma 14.4.1 were update notes for USB hubs in Displays. But that nothing works?

Anyone have this Display or a similar problem or solution?

MacBook Air (M3, 2024)

Posted on Jul 6, 2024 2:19 PM

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Answer 1

Jul 13, 2024 8:55 PM in response to Psy_Psy

Modern Macs are reportedly picky about display transmission errors – as in, not wanting to tolerate any.

Is the USB-C cable the same one that worked with the other Macs? If not, have you double-checked that it is rated to be able to carry DisplayPort traffic?

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Answer 2

Psy_Psy Author

Level 1

5 points

Aug 5, 2024 12:01 PM in response to Psy_Psy

Here are an update.

The problem is been solved by a monitor firmware update.

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Answer 3

Barney-15E

Level 10

123,356 points

Jul 13, 2024 8:37 PM in response to Psy_Psy

macOS doesn’t push video over USB. The display needs to support DisplayPort or Thunderbolt through the USB-C port. It sounds like it does support one of those since it worked before. The fact that it also pushes USB 3.2 through the same port may be confusing Sonoma. If it is possible to disable USB on the port from the onscreen menu, try that.

Did you connect it directly to the USB-C port on the Mac?

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Answer 4

Jul 13, 2024 8:52 PM in response to Barney-15E

It shouldn't confuse Sonoma for the display to use USB-C (DisplayPort + USB + Power Delivery). That's a very common setup among displays with USB-C (DisplayPort) inputs.

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