Big Sur external monitor not working

Question

Created Dec ’20

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Update MacBook Pro 16" (Feb 2020) and now any external monitor I connect via Apple USB-C Digital AV Multiport Adapter will only work for about 3 mins then monitor goes to sleep. 11.1 did not seem to fix this issue.
Any help?
Thanks

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Answer 1

JeffCollier OP

Dec ’20

In the Settings app, in the Battery view, on the Power Adapter tab, is 3 minutes the setting for "Turn display off after"? For me, if I only use my external keyboard, my external monitor will go to sleep after duration set in my settings. I only need to touch my external TrackPad to keep my Mac Book Pro and monitor awake. While you wait for the fix from Apple, you could try to increase the duration in order to make the attempted sleeping less frequent.

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Answer 2

Mattmason1701 OP

Dec ’20

O M G if you are right, I'm the biggest *****!! Thanks for the tip, I'll let you know! 1 hour later... still an issue but not as bad....

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Answer 3

Mattmason1701 OP

Dec ’20

swapped out the HDMI cable and the USBC Digital AV adapter but still the problem persists.

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Answer 4

mjrnc OP

Feb ’21

I tried all sorts of things and finally just switched the monitor to a different port and it worked. No problems since.

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Answer 5

chelms OP

Jun ’21

Agreed with @mjrnc, it seems plugging in displays only via the LEFT laptop ports gives the best results.

See my full answer regarding 2 external monitors with docking station at https://developer.apple.com/forums/thread/666645?page=1#679566022 .

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