Stop mirroring of dual external displays: spanning issues with my MacBook

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Level 1

13 points

Stop mirroring of dual external displays: spanning issues with my MacBook

Hello community!

I have a 2017 MacBook running Catalina, and I just purchased 2 external Samsung CF392 displays from BJ's for a steal. Then, I picked up a UtechSmart adapter on Amazon to plug into my single USB-C port, which allows the 2 HDMI cables to be plugged in, as well as a power source USB-C (and another USB). That all seems to work, but the 2 external displays are mirroring each other.

How do I make them span so I may utilize 3 displays at once? I do not believe this is Daisy Chain compatible.

Thank you in advance!

kris10

MacBook, macOS 10.15

Posted on Aug 6, 2020 10:36 AM

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Answer 1

Top-ranking reply

neuroanatomist

Level 9

55,551 points

Aug 6, 2020 11:22 AM in response to kris10haley

You can't. Your mid-2017 MacBook supports one external display at up to 4096x2304 / 60 Hz. With two displays connected, they're going to be mirrored. If you want to run two separate external displays, you need a new Mac.

The current entry-level MacBook Air supports two external displays at 4K.

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Answer 2

kris10haley Author

Level 1

13 points

Aug 6, 2020 3:04 PM in response to neuroanatomist

😭 I worked so hard to afford my rose gold laptop that I love. Understood, just not ready to purchase a new machine anytime soon.

Nobody's worked out a hack? 🙏🏻

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Stop mirroring of dual external displays: spanning issues with my MacBook

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