Multiple Monitors via one USB-C port on Macbook Pro 2021 / DisplayPort Alt Mode

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MarioKind Author

Level 1

5 points

Multiple Monitors via one USB-C port on Macbook Pro 2021 / DisplayPort Alt Mode

He,

I have searched a lot, but did not find an answer.

I have a new MacBook Pro 2021 with M1Pro chip.

I want to attach 2 displays (Eizo EV2495).

One display is connected to the second one via USB-C itself.

The second display is connected to the MacBook. The supported / required feature is DisplayPort Alt Mode.

In system preferences, I see only one external display, the external displays are mirrored.

Anybody knows a fix or whether DisplayPort Alt Mode is supported?

Thanks.

MacBook Pro 14″, macOS 12.2

Posted on Mar 17, 2022 11:21 AM

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Answer 1

Top-ranking reply

Grant Bennet-Alder

Level 10

140,291 points

Mar 18, 2022 2:14 PM in response to MarioKind

Macs only support daisy-chained displays over a ThunderBolt connection. The first device AND the first cable must BOTH be genuine ThunderBolt.

USB-C or DisplayPort will NOT suffice, because their cables do not have enough bandwidth to support TWO high speed displays' data required for daisy-chaining.

Your 1920 x 1200 displays have these featured inputs:

USB Type-C (DisplayPort Alt Mode, HDCP 1.3),

DisplayPort (HDCP 1.3),

HDMI (HDCP 1.4) -- good for up to 4K at 30Hz, or 2K at 60Hz, or HD at possibly higher refresh rates, if available.

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Answer 2

JessS19

Community Specialist

Mar 18, 2022 1:27 PM in response to MarioKind

Greetings, MarioKind.

To start, congrats on your new Mac! In regard to setting up multiple displays with your Mac:

“For Mac computers with the Apple M1 Chip: You can connect a single external display to your Mac. Docks don’t increase the number of displays you can connect. On a Mac mini with M1 chip, you can connect a second display to the HDMI port. See the Apple Support article Mac computers with Apple silicon.

” Use one or more external displays with your Mac

We hope this helps!

Sincerely.

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Multiple Monitors via one USB-C port on Macbook Pro 2021 / DisplayPort Alt Mode

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