@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.