External display has a band of offset pixels

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External display has a band of offset pixels

Sometimes when my MacBook Air (M1) wakes up, the external display (a brand new LG Ultrafine 5K from Apple) has a vertical strip which is offset by 2 pixels upward. Sleep/wake does not fix it, but unplugging the monitor and then reconnecting it does.

(The image below is supposed to be rotated but this forum doesn't display/upload it properly)

(Unrelated: when plugged in to this display, I can only rarely wake up the computer using my external bluetooth keyboard/mouse... it works sometimes but usually not)

MacBook Air 13″, macOS 11.0

Posted on Nov 25, 2020 6:59 AM

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Answer 1

Chris_D13

Community Specialist

Dec 3, 2020 9:14 AM in response to bluesky00

Greetings bluesky00,

Thanks for visiting the Apple Support Communities! It seems your external display has a band of pixels that appear out of place.

Ensure macOS is updated, and reach out to Apple Support if the issue persists:

Kind regards.

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Answer 2

Dec 14, 2020 9:31 AM in response to bluesky00

I experience the exact same behavior sporadically on both a 2018 MBP 15" running Mac OS 10.14.6 as well as on my own 2019 MBP 16" running the Big Sur 11.1 Beta 2 when connected to an ultrafine 5K monitor.

I only see this issue when the monitor is connected on boot and the issue starts immediately after the screen transitions from the login screen to the actual desktop.

Occurs about 5% of the time for me and the same work around of unplugging and replugging the display clears the issue.

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Answer 3

Dec 29, 2020 4:54 PM in response to bluesky00

Check to make sure your cable to the monitor is not crossed with other cables or electrical sources. If that doesn't work, try a different cable.

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External display has a band of offset pixels

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