I'm seeing this bug, typically related with inserting a smartcard reader, AND THEN inserting the smartcard:
[12030.538992] usb 1-1: new full-speed USB device number 6 using xhci_hcd [12030.668391] usb 1-1: No LPM exit latency info found, disabling LPM. [12030.676665] usb 1-1: New USB device found, idVendor=058f, idProduct=9540 [12030.676670] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [12030.676672] usb 1-1: Product: EMV Smartcard Reader [12030.676674] usb 1-1: Manufacturer: Generic [12068.557399] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 5 ep 6 with no TDs queued? This is one reader for the Spanis DNIe (Electronic id card, used for a lot of official stuf) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1058030 Title: Log full of xhci_hcd WARN To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1058030/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs