My setup is as follow:

  • MacBook Pro M1 Max (macOS 12.5)
  • External monitor: Dell P3421W
  • USB webcam connected to USB-A port in monitor, monitor is connected to Macbook via USB-C.

My issue is that every so often the webcam is not detected by the laptop. But after I disconnect and reconnect it, it is detected and working properly. Then after the laptop goes to sleep, it is often not recognized again until I disconnect and reconnect.

I tried few webcams - all have the same issue, so that leads me to think the issue is somewhere between the monitor and laptop? Is that a known issue? Any idea how to debug it?

  • Update: Using the most up to date driver, I still have the same issue.
    – duduamar
    Sep 19, 2022 at 21:53

1 Answer 1


There is a firmware update available for your monitor claiming to fix USB issues with Macbooks:

Fixes & Enhancements
2. Fix Apple Macbook USB compatibility issues.

You can find the update package on the Dell support page.

  • That didn't help sadly. I still have the same issue after upgrading the monitor's firmware.
    – duduamar
    Aug 22, 2022 at 16:49
  • @duduamar Did you also install the manufacturers drivers? Aug 22, 2022 at 17:27
  • What do you mean? I installed the latest firmware update from Dell
    – duduamar
    Aug 22, 2022 at 17:31
  • @duduamar The site I've linked contains links to 3 different packages. The firmware update, Dell Display Manager, and Driver for Dell P3421W Monitor Aug 22, 2022 at 17:38
  • I only see the firmware update in that link
    – duduamar
    Aug 23, 2022 at 18:36

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