2 Monitors Detected, but only 1 displaying picture

[SqueakyNinja]

Originally Posted by jochem

I have exaclty the same issue on my M1 with Monterey:

macOS Monterey version 12.3.1
MacBook Pro M1, 2020
Display Link 1.6.1

Both screens detected but only one showing something. Other screen is turned on and auto detected on HDMI port but nothing showing.

One screen is a 1440p 144hz other is 1080p 144hz. The 1080p is not working. When i mirror display from main to the 1080p monitor all monitors work but that is useless.

Tried other ports on monitor, different cables, different resolutions but nothing works. Other setup with two of the same monitors (different from what iam using now) does work without any problems. Maybe the issue is two external monitors with different resolutions?

I've got two identical Dell U2515H, where the second one doesn't work unless being mirrored to. So I have the same resolution for both, and the same issue.

I did however luckily solved the issue for me. I swapped places of my HDMI cables, and then it worked. I guess on of the cables are of an older version and wasn't compatible with the displaylink adapter.

[jochem]

Originally Posted by SqueakyNinja

I've got two identical Dell U2515H, where the second one doesn't work unless being mirrored to. So I have the same resolution for both, and the same issue.

I did however luckily solved the issue for me. I swapped places of my HDMI cables, and then it worked. I guess on of the cables are of an older version and wasn't compatible with the displaylink adapter.

I will try again with different HDMI cables.

[drpmason]

I have a MBP M1 and just bought the Dell 6000 to run 3 external monitors

I can get 2 x DP>DP working but the DP>USB and/or DP>USBc wont work.

Does anyone know if this is a Monterey 12.3 problem with the Dell 6000 ports or with the Displaylink download?

My guess is its an Apple/Dell issue but any advice appreciated!

[Mecallie]

Originally Posted by SqueakyNinja

I've got two identical Dell U2515H, where the second one doesn't work unless being mirrored to. So I have the same resolution for both, and the same issue.

I did however luckily solved the issue for me. I swapped places of my HDMI cables, and then it worked. I guess on of the cables are of an older version and wasn't compatible with the displaylink adapter.

You absolute hero!

I was troubleshooting this in software for ages. Could not figure out why it would not work on one laptop with Linux mint and not on the other, also with Linux mint. I am also using two Dell U2515H screens: on my Dell laptop it works fine. On my Asus ExpertBook I saw 3 screens in the config, but only 1 external and the laptop screen would work. Seems it is some bizare HW issue with some USB C dongles (I am using a Lenovo ThinkPad USB-C dongle/dock) or something, can't be the cable, I did not replace that.

I just swapped the HDMI cables on the USB-C dongle: works! I now have an image on 3 screens (laptop + 2 external). Before that I would see 3 screens in the config panel (including the correct specs), but would get an image on my laptop and 1 external screen only.

Registered for the sole purpose of thanking you!