It's probably more an issue with the thunderbolt dock. I had the same exact problems and they were traced to bugs in the dock firmware. You can try updating the

It's probably more an issue with the thunderbolt dock. I had the same exact problems and they were traced to bugs in the dock firmware. You can try updating the firmware and see if that fixes it for you. Unfortunately, Lenovo bios/firmware has been really bad for Linux in the last few years.