I just updated macos tahoe yesterday, and now the clamshell is not working

I usually use my Mac in clamshell mode, but after updating macOS yesterday, I came home from work today and suddenly clamshell mode isn’t working. Why is this happening? any solution?

MacBook Pro (2017 – 2020)

Posted on Sep 17, 2025 05:38 PM

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2 replies

Sep 17, 2025 06:01 PM in response to Serendipity_

Serendipity_ wrote:

I usually use my Mac in clamshell mode, but after updating macOS yesterday, I came home from work today and suddenly clamshell mode isn’t working. Why is this happening? any solution?


So this is a new issue with Tahoe—


To enable MacBook clamshell mode, you must connect your MacBook Pro to an external display, a power adapter, and an external keyboard and mouse.


Did you try all variations, different cable connection, different port, etc...(?)

I just updated macos tahoe yesterday, and now the clamshell is not working

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