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* Mic testing in what apps? Does the issue happen in all apps?
* Have you tried closing the webcam shutter which might "release" the webcam and mic from the apps, wait 10 seconds, then opening the webcam shutter?

Hi Chris.

I'm mostly in Zoom and Teams for conferencing during the day.  The mic issue happens on both.  

I close the webcam shutter whenever I'm not video conferencing for privacy's sake.

If I test AV directly in the Zoom app during the issue, the mic is still unresponsive until I restart the monitor.  During the restart, AV kicks in on my Latitude laptop and works as expected.

Mark

* Open the P3424WEB Menu

* Go to Others
- Run Factory Reset
- Verify DDC/CI = On

* Go to Personalize
- Change Fast Wakeup to On

* Go to Audio & Webcam
- Verify Microphone = On
- Verify Webcam & Presence Sensor = Enable

* Exit the Menu and retest

@DELL-Chris M​ Thanks again, Chris.  All of those settings were set as you suggest, apart from fast wake up - I've changed that, I'll let you know if it has an effect - thanks a lot.

Logged on this morning and checked mic audio in my Zoom settings first thing, and there's no response from the mic.  Fast wake up has persisted, as have the other settings.

Also - I had a chat going with Dell and they terminated it saying this:

I don't think this is something for the retailer.  The behaviour is either config or bug, I think.

Are you saying  fast wake up has made it worse? 

Zoom seams to like to default to Muted. (I assume the red light wasn't on, at the bottom left corner) 

@Andy K​ Hey - no, I don't think that fast wake up has made any difference in particular.  There's nothing to suggest Zoom has muted anything - the image that I was showing above is just a "test audio" thing that Zoom has in it - and it's showing that when I run a test there's no input from the mic at all until I restart the monitor.

While running Zoom, is DPN (Dell Peripheral Manager) or DDM (Dell Display Manager) running in the background? If yes, disable them and retest.

@DELL-Chris M​ Yes, both are running.  I'll disable them tonight and test next week.