2

The late 2020 M1 MacBook Pro does not seem to be playing well with the LG UltraWide 38WK95C 38-inch external display directly connected with a USB-C cable. The display blacks out (as if the cable physically disconnects) every hour or so. The issue usually resolves itself within a few seconds but sometimes I have to restart the computer to get it in a good state. The problem occurs with both USD-C ports and does not exist with the late 2016 MacBook Pro.

How can I diagnose and fix this external display issue?

11
  • Which cable are you using? My 4K belkin ones are working very well so far.
    – bmike
    Nov 23, 2020 at 18:48
  • Same cable for both MacBooks? The other option is to try a different monitor Get and use DisplayPort input and boot HDMI to match the LG as close as possible. If the issue persists, you might have a problem with the Mac itself warranting further diagnosis
    – Allan
    Nov 23, 2020 at 19:58
  • @Allan: Yes, same cable for both MacBooks.
    – Randomblue
    Nov 23, 2020 at 21:30
  • @bmike: It's the cable that came with the LG external display.
    – Randomblue
    Nov 23, 2020 at 21:30
  • 1
    I would swap it out with a new one - you need a spare eventually and I’ve seen vendor cables be less reliable than the Belkin ones. We probably replace one in 20 of the LG over the first year and less than 1 in 100 of the Belkin.
    – bmike
    Nov 23, 2020 at 21:37

1 Answer 1

0

The problem seems to have gone away after updating macOS Big Sur from 11.0.1 to 11.1.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .