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@Baio77 I've tried your TB3 patch on my 5400 which happens to have the Thunderbolt option, and it worked perfectly. During the testing, I've found that my TB3 device (Dell TB16 docker) has a flaky connection, likely due to the wear of the connector pins, which made intermittent contact and causing similar problem I've encountered with the 7400. If a good connection is made, the 5400 worked perfectly on the TB3 port, either cold or hot plug. So I believe the 7400 would be working fine if I had a good cable.

1. Download the appropriate version from the Releases and extract the zip file. Let’s assume that you downloaded “ALCPlugFix-Swift-RELEASE-1.5.zip” to download folder, and extracted the zip file in the same place (by double-clicking). You would have a new folder “ALCPlugFix-Swift-RELEASE-1.5” created. Right-Mouse-Click on the new folder icon -> Services -> New Terminal at Folder. A new terminal window would be opened at the current folder path: /Users/YOURNAME/Downloads/ALCPlugFix-Swift-RELEASE-1.5 (You can type “pwd” to verify it) 2. Copy the edited sample.plist file (in this case: ALC295-DELL7400.plist) to somewhere safe. I placed it in “Monterey HD\users\shared”, where Monterey HD is the name for my macOS drive. You may have a different name. 3. At the terminal (opened in step 1), type: ./install.sh Follow the instruction. When it asked for .plist file, drag “ALC295-DELL7400.plist” icon to the terminal, from the location you stored in step 2 above (in my case, it is from “Monterey HD\users\shared\”). You may encounter message like "ALCPlugFix is from unknown source” (1st time install) , just ignore it. After install is completed, go to folder: /usr/local/bin (this is where ALCPlugFix is installed). Right-Mouse-Click on ALCPlugFix icon -> Open, then Open again to allow it to run. This would give it the permission to run. Add "alcverbs=1 alcid=77" to the boot args. Reboot.