M1 Mackbook Air - no displays detected

[jfedlin]

DisplayLink Manager always says "No DisplayLink-enabled display detected", no matter what I try. I have scoured the internet for days and I have not been able to find any solution that resolves this issue. I am having this problem with two different DisplayLink devices on two different M1 Macbook Airs and an M2Pro Macbook Pro. Both DisplayLink devices work flawlessly on Windows and Fedora Linux machines so I know the docks, cables, and monitors are not the problem.

M1 Macbook Air with Sequoia (15.2)
DisplayLink driver (1.11.0 build 28)
Dell D3100 Dock

I installed the driver, set the screen recording option, rebooted, connected the dock, allowed the USB device to connect. No luck. I verified that the USB device is listed in the USB list in the system information with a good PID, disconnected the dock from the laptop, disconnected all peripherals and power from the dock for more than a minute, reconnected power/peripherals, then reconnected the dock to the laptop. Still no luck. I've tried using the cleaner tool, rebooting, installing the driver, rebooting, still no luck. I've tried all of the USB ports on a small thunderbolt hub for the mac, tried removing the hub and connecting directly to the thunderbolt USB-C port using a USB-C adapter that came with the dock. I even tried unplugging the monitors for a bit and disabling Wifi, which some people claims to have worked for them. I have repeated these steps many times in various combinations and with reboots after each step. I even tried to use an older driver (10.3). Nothing seems to result in any different behavior at all.

It seems that other people have gotten this to work, so I still have hope that there is some possible configuration that could be interfering. I am just not very knowledgeable on MacOS to know where to look for these things. Is there something else I can try, or is there a log that I can inspect?

[rboerner]

Originally Posted by jfedlin

DisplayLink Manager always says "No DisplayLink-enabled display detected", no matter what I try. I have scoured the internet for days and I have not been able to find any solution that resolves this issue. I am having this problem with two different DisplayLink devices on two different M1 Macbook Airs and an M2Pro Macbook Pro. Both DisplayLink devices work flawlessly on Windows and Fedora Linux machines so I know the docks, cables, and monitors are not the problem.

M1 Macbook Air with Sequoia (15.2)
DisplayLink driver (1.11.0 build 28)
Dell D3100 Dock

I installed the driver, set the screen recording option, rebooted, connected the dock, allowed the USB device to connect. No luck. I verified that the USB device is listed in the USB list in the system information with a good PID, disconnected the dock from the laptop, disconnected all peripherals and power from the dock for more than a minute, reconnected power/peripherals, then reconnected the dock to the laptop. Still no luck. I've tried using the cleaner tool, rebooting, installing the driver, rebooting, still no luck. I've tried all of the USB ports on a small thunderbolt hub for the mac, tried removing the hub and connecting directly to the thunderbolt USB-C port using a USB-C adapter that came with the dock. I even tried unplugging the monitors for a bit and disabling Wifi, which some people claims to have worked for them. I have repeated these steps many times in various combinations and with reboots after each step. I even tried to use an older driver (10.3). Nothing seems to result in any different behavior at all.

It seems that other people have gotten this to work, so I still have hope that there is some possible configuration that could be interfering. I am just not very knowledgeable on MacOS to know where to look for these things. Is there something else I can try, or is there a log that I can inspect?

Given your description of the behavior, if you have not done so already I would suggest reporting the issue to DisplayLink directly by following the process outlined here --> https://support.displaylink.com/know...to-displaylink

[jfedlin]

I found the issue. BitDefender was silently blocking DisplayLink. I tried whitelisting each subcategory for Device Control in BitDefender, and found that DisplayLink works fine when the subcategory for Windows Portable on USB is whitelisted.