Your solution is Dell Display Manager app; however, no DDM for mac yet even they promised the spring of 2021.

I've been struggling with my U3821DW and MacBook Pro video signal problem. You can see my post here.

Tested with same MacBook on different brands like LG Ultrafine perfectly works. Then I contacted to Apple and Dell both for a support multiple times, but no luck. I searched this forum then I found this thread =

Demystifying USB-C and Thunderbolt, i.e. adapter and dock capabilities/limitations

By the way, you should test your MacBook M1 with followings

1. While plugged the USB-C cable to MacBook restart your computer
2. Observe whether Dell monitor is waiting for a signal or not.
3. Reply here please : )

So as far as I understood that cable changing may help according to above topic.

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@saxahan wrote:

By the way, you should test your mac with followings

1. While plugged the usb-c cable to macbook restart your computer
2. Observe whether dell monitor is waiting for a signal or not.
3. Reply here please : )

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This seems like another issue (not my audio issue), but here are the result I'm seeing:

When I restart the Mac with the USB-C cable connected, the monitor stays dark, the Macbook doesn't recognize the monitor. If I unplug the USB-C cable and insert it again, the monitor comes to life.

This doesn't happen when I have my cable plugged in and start into Windows or Linux.

You think this is a cable issue? Do you need specific cables for Mac with USB-C?

Well, I think this problem is on Dell's side.

Reported here https://www.dell.com/community/Monitors/U3818DW-USB-Type-C-power-delivery-problem/td-p/7452974

and here  https://www.dell.com/community/Monitors/U3419W-MacBook-USB-Type-C-sleep-wake-issues/m-p/7342413

For me this is a huge problem because I always shutdown my computer after my daily work's ended. Unplugging then plugging the cable every morning can affect type-c port. You should go on this issue primarly. On the other hand, controlling audio could may be solved in next updates of macos.

I dont know this is a cable issue or not, but Dell must do something!

What the priority issue is, will be different for different people. For me, I bought this to replace multiple devices:

• USB-Hub
• Ext. Monitor + Laptop Screen setup
• Speakers

Because in online reviews, the speakers were praised for being "great for monitor speakers" and this is just enough for my taste, I thought I don't need external speakers anymore as they take up space on my table.

Well so far, so bad:

• Often random problems where the speaker sound is very thin. Sometimes the issue goes away after some minutes, sometimes not. Happening on Windows, Mac, Linux. Extremely frustrating as I want to do video calls at work and can't hear other people sometimes!
  Dell Support told me to install the Windows drivers and utilities that are available via Dell, well it doesn't even solve the problem on Windows! They must do something on this issue, maybe a firmware update.
  Thread: https://www.dell.com/community/Monitors/U3821DW-built-in-9W-speakers-soft-for-the-first-few-minutes/m-p/7844304#M134052
• I can't control the sound volume on Mac. Doesn't matter if it's an Apple or Dell problem. It's bothering me.

The USB-C after restart problem doesn't bother me personally, as I almost never restart my Macbook.

Hi and thank you for the answer.

I'm here to report my issue has been resolved. The way I fixed it was by installing a 3rd party application, as suggested by Dell Support.

The Application I installed was MonitorControl. You can find the newest releases here: https://github.com/MonitorControl/MonitorControl/releases

At the point in time I'm writing this, only the beta releases of the newest version of MonitorControl works with the M1 Mac. As they are beta releases, they can contain more bugs as usual, so use at your own risk. Check out this thread and report any issues you may find to the devs: https://github.com/MonitorControl/MonitorControl/issues/323

I hope this will help others who face similar issues.

Thanks. I've just switched to MonitorControl from EQMac because it crashes quite reguarly and causes issues on my M1.