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dannysimsks Author

Level 1

21 points

External Monitor with Big Sur

Hi everyone, anybody experiences external monitor no longer receiving signal when macbook pro lid fully closed? I have been running my macbook pro with external monitor with closed lid working just find. Couple days ago after upgraded to Big Sur it works for few days and today it stop working. I have to open the lid then only the external monitor works. But it is some kind a like sharing screen between external monitor and macbook pro monitor.

Anybody experiencing the same with Big Sur?

Thanks in advanve.

Danny

MacBook Pro 13″, macOS 11.0

Posted on Nov 18, 2020 4:06 AM

Best reply

jeremychance23

Level 1

14 points

Posted on Mar 9, 2021 8:58 PM

I rang Apple - clamshell mode only works when you have power into the MacBook. In my case, I didn't - and got all the results everyone is talking about here. Try that:

Make sure your Mac has power. (Or monitor is supplying power to Mac)

RULE: Without power, clamshell mode with an external monitor does not work !

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External Monitor with Big Sur

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