Hi Sarah and all, While debugging https://bugzilla.kernel.org/show_bug.cgi?id=34782, there are many of those messages after the reboot. usb 9-2: new high speed USB device number 3 using xhci_hcd xhci_hcd 0000:05:00.0: ERROR: unexpected command completion code 0x0. xhci_hcd 0000:05:00.0: ERROR: unexpected command completion code 0x0. usb 9-2: device not accepting address 3, error -22 usb 9-2: new high speed USB device number 4 using xhci_hcd xhci_hcd 0000:05:00.0: ERROR: unexpected command completion code 0x0. xhci_hcd 0000:05:00.0: ERROR: unexpected command completion code 0x0. usb 9-2: device not accepting address 4, error -22 usb 9-2: new high speed USB device number 5 using xhci_hcd xhci_hcd 0000:05:00.0: ERROR: unexpected command completion code 0x0. xhci_hcd 0000:05:00.0: ERROR: unexpected command completion code 0x0. usb 9-2: device not accepting address 5, error -22 usb 9-2: new high speed USB device number 6 using xhci_hcd xhci_hcd 0000:05:00.0: ERROR: unexpected command completion code 0x0. xhci_hcd 0000:05:00.0: ERROR: unexpected command completion code 0x0. usb 9-2: device not accepting address 6, error -22 hub 9-0:1.0: unable to enumerate USB device on port 2 0000:05:00.0 is the Express Card USB 3.0 card. # lspci 05:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 03) >From lsusb, there is no usb 9-2 but usb 9-1. I guess 9-2 is one of end port from the root hub of the Express Card. # lsusb Bus 009 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub As the results, the end device - USB 2 MP3 (9-3?) device could not be detected until re-attached. Does it look like a hardware or software problem? Any way to debug this enumeration problem any further? CAI Qian -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
