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Shabiizz Author

Level 1

5 points

Mac recognizing dual external displays as one monitor

I am trying to connect my two BenQ external monitors to my M1 Macbook Pro 13. I am not using any cheap connector but using a Dell WD22TB4 Docking station to connect both monitors. The problem is both monitors are on. and showing the same display as each other. however, in the system display settings, I only see one external monitor connected. the second monitor isn't even showing up there. even though both monitors show the same display together.

I have installed Display Link Manager. and have checked all cables. tried with both HDMI as well as DisplayPort 1.4. but no success.

Any ideas on how to fix this?

Posted on May 29, 2023 6:46 PM

Top-ranking reply

Grant Bennet-Alder

Level 10

133,429 points

Posted on May 28, 2024 8:16 AM

With one minor exception, the same rules we learned for the M1 and M2 still apply to the M3 models. Display interfaces are generated deep inside the system on a chip. How many there are depends on the exact type of Processor:

M3 (plain) like the 13-in and 15-in supports up to ONE External fully hardware-accelerated external display. Except the M3 MacBook Air models with 13 or 15-in display, which can support a second external display instead of the built-in display when you close the cover on the built-in display. (...and power must be connected.)

M3 PRO processor supports up to Two fully hardware-accelerated external displays.

M3 MAX processor supports up to Four fully hardware-accelerated external displays.

Tech Specs now available here:

MacBook Pro - Tech Specs - Apple

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Mac recognizing dual external displays as one monitor

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