Yes, this appears to be either a Firmware or Hardware issue. I have managed to get everything working via a process of removing other PCIe devices until it worked in Windows and running a firmware update at that point before putting all the other devices back. It's working correctly now.
** Changed in: linux (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1752574 Title: Thunderbolt NULL pointer dereference in linux 4.15 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1752574/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs