I don't know much about xHCI so Mathias can comment on that. I do remember seeing messages like:
usb usb2-port1: Cannot enable. Maybe the USB cable is bad? in the past but not sure if it is only with ICL. It is also weird that the TCSS xHCI is doing anything if you plug TBT 3 device since USB is not tunneled. Might be something related to Type-C or PD. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in 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 Status in linux package in Ubuntu: Confirmed Bug description: Since we can't use bugzilla for USB bugs, let's use Launchpad so we can attach dmesg :) System: XPS 9300 ICL Dock: Dell WD19TB Thunderbolt dock Linux: 5.7-rc5 Right after the dock is plugged, [ 127.205823] xhci_hcd 0000:00:0d.0: Get port status 2-1 read: 0x10202a0, return 0x10341 [ 127.205832] usb usb2-port1: status 0341 change 0001 CAS is flagged so warm-reset ensues: [ 127.313467] usb usb2-port1: do warm reset However, it seems nothing is connected to usb2-port1, causes many warm-reset fail, hence this error message: [ 132.158968] usb usb2-port1: Cannot enable. Maybe the USB cable is bad? This issue doesn't happen on CML system with AR/TR TBT controller. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1878602/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
