USB-C display connects to 2017 MBP but not 2021 M1 MacbookPro

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Level 1

5 points

USB-C display connects to 2017 MBP but not 2021 M1 MacbookPro

I have an Eizo ev2789 monitor, a USB-C cable, a 2017 15" MacbookPro running macOS 11.2, and a 2021 16" M1 Max MacbookPro running macOS 12.2.

The 2017 MBP (and various windows and linux laptops) connect to the display as expected. The 2021 MBP does not recognize the monitor at all. In System Information, no Display is added when the monitor is connected. The ports on the 2021 MBP work fine with other devices.

MacBook Pro (2020 and later)

Posted on Feb 9, 2022 3:58 PM

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Answer 1

Top-ranking reply

BobHarris

Level 9

56,747 points

Feb 9, 2022 6:38 PM in response to catopire

Are you using the same cable that worked for the older Mac?

USB-C cables are not created equally.

I have a USB-C monitor, and it was not until I got a USB-C 3.1 gen 2 WITH DisplayPort support, was I able to use any cable, besides the short cable that came with the monitor.

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Answer 2

lllaass

Level 10

210,513 points

Feb 10, 2022 1:00 AM in response to catopire

Try booting to Safe Mode. That boot up takes minutes and clears caches and other things that may resolve your problem.

How to use safe mode on your Mac - Apple Support

Does the monitor work in Safe Mode?

A lot of times just boot to Safe Mode followed by normal boot resolves problems.

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Answer 3

Feb 13, 2022 1:35 PM in response to catopire

Did you try with different USB-C ports on the MBP? I seem to remember a recent thread where a display worked in only one or two of the ports. It is worth a try, I think.

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Answer 4

Feb 13, 2022 12:17 PM in response to catopire

Hold down the Option key and choose System Information from the Apple menu.

Is the display appearing at all in System Information, under USB?

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Answer 5

catopire Author

Level 1

5 points

Feb 13, 2022 11:48 AM in response to Luis Sequeira1

I am entirely confident that the cable is not related to the problem. I have used this exact cable to connect four different computers running five different operating systems (Windows 8, Windows 10, Ubuntu, macOS 11.2, macOS 12.2) to this display, and none had any trouble except the 2021 MBP running 12.2. I have since verified again that the other computers work fine.

The cable is USB-C 3.2, purchased in bulk for my institution. Here is the specification sheet: https://www.pimfg.com/spec_pdf/USB3-CM-CM-3.pdf

Since posting, I have borrowed an HDMI cable, and I am able to connect to the display using that. However, I still want to get the usb-c working, as the display includes a usb 2.0 dock accessible over a usb-c connection.

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Answer 6

Feb 10, 2022 1:03 AM in response to catopire

Can you give details about the cable? Some connections may require additional software.

Maybe you have some Displaylink software in the old mac but not the new one?

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Answer 7

Mar 20, 2022 10:51 AM in response to catopire

Wait a minute, did you by any chance have DisplayLink software installed in your other mac?

Some displays require this third party software.

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Answer 8

catopire Author

Level 1

5 points

Feb 10, 2022 12:20 AM in response to BobHarris

Yes, I am using the same usbc cable in all cases. I still possess the 2017 MBP. The only variable changing is the computer.

Aside from some basic user software like microsoft office, the 2021 MBP is a fresh installation. I have not installed any display or peripheral management software, and I have not installed any system extensions, disabled SIP, etc.

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