New Macbook M3 Pro cannot connect to 2 monitors

Question

New Macbook M3 Pro cannot connect to 2 monitors

I recently purchased a Macbook M3 pro. I have tried multiple docking stations, connecting into my Mac and a doc, a HDMI adapter, everything I can think of and I cannot get my M3 to attach to my 2 monitors. Just for giggles, I reconnected my M1 in the same setup - worked perfectly. (Yes, I am closing the lid.) I've tried it in multiple workstations in the office, had assistance from my other Mac folks... NOTHING. Is there something I should be looking at on the Mac itself? Seems to be an issue with the Mac and not the setup. Anyone else have this issue? Any suggestions? I'm beyond frustrated and missing my old Mac.

MacBook Pro (M3 Pro, 2023)

Posted on Aug 8, 2024 7:54 AM

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Answer 1

Aug 8, 2024 11:43 AM in response to Grant Bennet-Alder

I upgraded to 14.6.1. THAT DID IT! Thanks. 3 months of my life I will NEVER GET BACK! :)

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Answer 2

Aug 8, 2024 11:11 AM in response to BrooklynNerdGirl

If and ONLY If you run the latest MacOS 14.6, that feature was enabled in that version, for MacBook Pro with (plain) processor when the lid is closed.

Use dual monitors with your MacBook Air and MacBook Pro with M3 chip - Apple Support

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Answer 3

Aug 8, 2024 11:18 AM in response to BrooklynNerdGirl

Re: Tobenone UD5015DM

that is a USB-C docking station, and it supports ONE fully-hardware-accelerated display when connected by a single USB-C cable.

Thanks to the “InstantView” Driver, this MacBook Air docking station can break the single extend display limitation of 2020 M1/ 2022 M2/2023 M3 Macbook. It can extend dual/triple monitors, and easily extend your home office or office workspace.

These additional displays are "fake" displays, and are NOT suitable for displaying full motion video, and may make you queasy when used with a mouse because tracking is slow.

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Answer 4

Aug 8, 2024 10:19 AM in response to BrooklynNerdGirl

EXACTLY which model-year and model Mac M3?

what macOS are you running?

using Most Docks does NOT increase the number of fully hardware accelerate displays you can connect. A genuine Thunderbolt Dock keeps it the same, and all other reduce the number of displays you can connect.

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Answer 5

Aug 8, 2024 11:08 AM in response to Grant Bennet-Alder

Macbook Pro 14 inch, Nov 2023, M3, running Sonoma 14.5. This dock is a Tobenone UD5015DM, and works with my M1. Works with my coworker's M2. Doesn't work with mine. It's built for an M3, and it's the newest model.

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New Macbook M3 Pro cannot connect to 2 monitors

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