Tries booting with the chain disconnected from the dock, and as expected - the system boots correctly with the dock attached and built-in USB devices present, after which plugging the USB cable in works well.
The problem seems to only be when external USB devices are connected to the dock. Here's how the dock's USB controller tree looks after everything is plugged in: ----8<---- /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M ID 1d6b:0002 Linux Foundation 2.0 root hub |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/7p, 480M ID 0424:2807 Standard Microsystems Corp. Hub |__ Port 3: Dev 4, If 0, Class=Hub, Driver=hub/5p, 480M ID 0424:2734 Standard Microsystems Corp. |__ Port 4: Dev 7, If 2, Class=Audio, Driver=snd-usb-audio, 480M ID 03f0:a707 HP, Inc |__ Port 4: Dev 7, If 0, Class=Video, Driver=uvcvideo, 480M ID 03f0:a707 HP, Inc |__ Port 4: Dev 7, If 3, Class=Audio, Driver=snd-usb-audio, 480M ID 03f0:a707 HP, Inc |__ Port 4: Dev 7, If 1, Class=Video, Driver=uvcvideo, 480M ID 03f0:a707 HP, Inc |__ Port 2: Dev 6, If 0, Class=Hub, Driver=hub/4p, 480M ID 05e3:0608 Genesys Logic, Inc. Hub |__ Port 4: Dev 8, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M ID 04d9:2013 Holtek Semiconductor, Inc. Keyboard [Das Keyboard] |__ Port 4: Dev 8, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M ID 04d9:2013 Holtek Semiconductor, Inc. Keyboard [Das Keyboard] |__ Port 5: Dev 10, If 0, Class=Human Interface Device, Driver=usbhid, 480M ID 0424:274c Standard Microsystems Corp. |__ Port 1: Dev 5, If 0, Class=Hub, Driver=hub/5p, 480M ID 0424:2734 Standard Microsystems Corp. |__ Port 4: Dev 9, If 2, Class=Human Interface Device, Driver=usbhid, 12M ID 046d:c52b Logitech, Inc. Unifying Receiver |__ Port 4: Dev 9, If 0, Class=Human Interface Device, Driver=usbhid, 12M ID 046d:c52b Logitech, Inc. Unifying Receiver |__ Port 4: Dev 9, If 1, Class=Human Interface Device, Driver=usbhid, 12M ID 046d:c52b Logitech, Inc. Unifying Receiver |__ Port 5: Dev 11, If 0, Class=Human Interface Device, Driver=usbhid, 480M ID 0424:274c Standard Microsystems Corp. |__ Port 5: Dev 3, If 0, Class=Audio, Driver=snd-usb-audio, 480M ID 0bda:4014 Realtek Semiconductor Corp. |__ Port 5: Dev 3, If 1, Class=Audio, Driver=snd-usb-audio, 480M ID 0bda:4014 Realtek Semiconductor Corp. |__ Port 5: Dev 3, If 2, Class=Audio, Driver=snd-usb-audio, 480M ID 0bda:4014 Realtek Semiconductor Corp. |__ Port 5: Dev 3, If 3, Class=Audio, Driver=snd-usb-audio, 480M ID 0bda:4014 Realtek Semiconductor Corp. ----8<---- -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1856161 Title: Thunderbolt dock fails to connect USB devices To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1856161/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs