MacBook Pro M4 suddenly not supporting two external monitors

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Level 1

4 points

MacBook Pro M4 suddenly not supporting two external monitors

I was using macbook pro m4 with two external monitors and built-in display without closing lid. But today it stopped supporting 2 external monitors. It supports the display either via HDMI or via the HDMI from hub connected in thunderbolt. Not both at a time. But if I close the lid, it supports both the external monitors. All of a sudden it happended in the morning when I booted. I tried restarting, disconnecting/conneting monitors.

[Re-Titled by Moderator]

Original Title: supporting two external monitors

MacBook Pro 14″

Posted on Sep 7, 2025 10:29 PM

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Answer 1

Sep 8, 2025 06:54 AM in response to jayanandan

there are many different items that could be disturbing your display support.

all M4 maces should support two fully hardware accelerated displays, even lid open.

But exactly which make&model displays, at what resolution, and using what interfaces can be a vexing issue. Cable specs can also be a problem.

¿which make&model displays?

¿what cables, adapters and docks are you using to make the connection?

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Answer 2

kaz-k

Level 9

51,012 points

Sep 7, 2025 10:54 PM in response to jayanandan

Hi,

I suppose it't the default MacBook connecting setting two external monitors at the same time.

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