Monitor blinking on external display connect.

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Level 1

15 points

Monitor blinking on external display connect.

Hello. I have a strange problem: when I connect external display to my macbook pro through official usb-c to usb/usb-c/hdmi connector some times it starts blinking (internal display) and have no picture on external one. After some times (may vary from 10 sec to couple minutes) it becomes normal. During this blinking process laptop becomes hot, but i see no process that actually making pressure to hardware. So do anybody have ideas what the problem?

MacBook pro 15 2018

usb-c to usb/usb-c/hdmi connector

external display LG ultra-wide 28,5 (2560 x 1080)

I had also checked to:

change hdmi cable (no luck)
change connector (no luck)
change all four usb-c on laptop (no luck)
reset nvram ans smc (no luck)
to setup different software that can affect ultrawide monitor (SwithResX and OnScreenControl) (no luck)

Also i have in system logs (about 100+ lines to each blink):

[ERROR] - Driver bug - rowBytes too small. Display 0x1b5614f3, ioModeID 0x80007000, ioModeDepth 0x1, bytePerRow = 32, width = 1, bitsPerPixel = 32, minRowBytes = 10240 stored width = 2560. Forcing minRowBytes (possibly still wrong).

With different params.

Regards

MacBook Pro w/ Touch Bar (2018 or later)

Posted on Jan 16, 2019 1:52 AM

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Answer 1

ptuchster Author

Level 1

15 points

Feb 13, 2019 7:16 AM in response to chris_g1

Thanks for your reply.

Unfortunately, I had already checked all this methods out. So only way I found today to make my display work is shut it off before connecting to laptop, then connect it, and, when mac is recognized it, turn it on. It helps me almost 90% times. Some time i need to repeat it twice.

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Answer 2

Joseph_S.

Community Specialist

Feb 13, 2019 7:56 AM in response to ptuchster

Hello ptuchster,

Thank you for the follow-up! If you're finding the behavior persists still, it's a good plan to work with Apple to look into it further. Check out this link for Apple's contact options: Contact Apple Support

Cheers!

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Answer 3

chris_g1

Community Specialist

Jan 17, 2019 2:31 PM in response to ptuchster

Hi there ptuchster,

Thanks for posting the Apple Support Communities! I see you're running into an issue with your MacBook when an external display is connected.

You've done some great troubleshooting so far, and that information helps rule out a number of causes. I have a link with some additional steps that might help you with this type of issue. I recommend giving these a try as your next step, if you haven't completed these yet: Get help with video issues on external displays connected to your Mac.

If you complete all of these steps and you get the same results, I recommend getting in touch with Apple directly to look at next steps. You can use the following link to Contact Apple Support.

I hope these steps help!

Take care.

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Monitor blinking on external display connect.

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