macOS Big Sur secondary monitor flickering - MacPro 2019

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macOS Big Sur secondary monitor flickering - MacPro 2019

I have two DELL P2414H Monitors, and after the update of my Mac 2019 for Big Sur version, one of the monitors are flickering. Never had a problem when using Catalina.

Basically, I have a docking station from Thinkpad and one of the monitors is connected to it and connects to my MacPro with USB-c and the other I am using a display port adapter and connected directly to my Mac. The monitor using USB-c is flickering after the update.

MacBook Pro 15″, macOS 10.15

Posted on Nov 16, 2020 3:46 AM

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Answer 1

Top-ranking reply

jeremy_v

Community Specialist

Nov 24, 2020 9:36 AM in response to ejamartins

Hey ejamartins!

Thanks for touching base here in Apple Support Communities. We're happy to help provide some steps to help isolate your external display issue.

Have you tried booting in and out of safe mode to see if the issue continues?

Safe mode will clear the system cache and repair directory related issues.

How to use safe mode on your Mac

Checking your hardware connections is also a good idea. If the issue continues you can also try resetting the NVRAM on the Mac.

Take a look at the resources below and keep us updated.

Get help with video issues on external displays connected to your Mac

Reset NVRAM or PRAM on your Mac

Cheers!

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Answer 2

ejamartins Author

Level 1

8 points

Nov 24, 2020 4:19 PM in response to jeremy_v

I wrote another question and basically solved the problem when updating the docking station firmware and when connecting using saving mode on Mac.

Both ways solved my problem. Thanks and now I can used both monitors are not flickering. :-D

thanks

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Answer 3

Jeff_W.

Community Specialist

Nov 27, 2020 7:40 AM in response to ejamartins

Hello ejamartins,

We appreciate you taking the time to keep us updated and we're glad to hear you were able to get this resolved. Please do not hesitate to reach back out if you run into any other complications.

Warm regards.

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macOS Big Sur secondary monitor flickering - MacPro 2019

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