> Is there any USB3 device connected at all? No. Only a Thunderbolt Dock is connected.
> Just stays in disabled/Disconnected, as if no device is connected. Because there's no device connected to it. Actually it seems to be completely unused. I wonder if we can disable the Bus 01/02 xHC completely, since all internal USBs are connected to the other xHC: $ lsusb -t /: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 10000M /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M |__ Port 5: Dev 2, If 0, Class=Vendor Specific Class, Driver=, 12M |__ Port 9: Dev 3, If 0, Class=Video, Driver=uvcvideo, 480M |__ Port 9: Dev 3, If 1, Class=Video, Driver=uvcvideo, 480M |__ Port 9: Dev 3, If 2, Class=Video, Driver=uvcvideo, 480M |__ Port 9: Dev 3, If 3, Class=Video, Driver=uvcvideo, 480M |__ Port 9: Dev 3, If 4, Class=Application Specific Interface, Driver=, 480M |__ Port 10: Dev 4, If 0, Class=Wireless, Driver=btusb, 12M |__ Port 10: Dev 4, If 1, Class=Wireless, Driver=btusb, 12M /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 10000M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M External USBs and Thunderbolt are also connected to Bus 03/04. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1878602 Title: When TBT dock is plugged into ICL TBT xHCI, port without device is in CAS state, causes many warm reset fail To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1878602/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs