Yrurtj

My external HDD dock require a frustrating sequence for mounting where plugging the usb cable must be the last step (ie insert HDD, power on, plug-in).

When I do this it works perfectly, but the cable is not very accessible, and I fear that frequent plug/unplug will eventually damage it.

So I tried to power-on the device while leaving the usb cable plugged. Sometimes it works and sometimes it doesn't.
When it does not work I get this message (dmesg):

[372734.412683] xhci_hcd 0000:00:14.0: Command completion event does not match command

[372734.412686] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command

[372739.622686] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command

[372739.826432] usb 3-5: device not accepting address 21, error -62

A lsusb -v gives:

Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

Device Descriptor:

  bLength                18

  bDescriptorType         1

  bcdUSB               3.00

  bDeviceClass            9 Hub

  bDeviceSubClass         0 Unused

  bDeviceProtocol         3 

  bMaxPacketSize0         9

  idVendor           0x1d6b Linux Foundation

  idProduct          0x0003 3.0 root hub

  bcdDevice            4.02

  iManufacturer           3 Linux 4.2.0-0.bpo.1-amd64 xhci-hcd

  iProduct                2 xHCI Host Controller

  iSerial                 1 0000:00:14.0

  bNumConfigurations      1

  Configuration Descriptor:

    bLength                 9

    bDescriptorType         2

    wTotalLength           31

    bNumInterfaces          1

    bConfigurationValue     1

    iConfiguration          0 

    bmAttributes         0xe0

      Self Powered

      Remote Wakeup

    MaxPower                0mA

    Interface Descriptor:

      bLength                 9

      bDescriptorType         4

      bInterfaceNumber        0

      bAlternateSetting       0

      bNumEndpoints           1

      bInterfaceClass         9 Hub

      bInterfaceSubClass      0 Unused

      bInterfaceProtocol      0 Full speed (or root) hub

      iInterface              0 

      Endpoint Descriptor:

        bLength                 7

        bDescriptorType         5

        bEndpointAddress     0x81  EP 1 IN

        bmAttributes            3

          Transfer Type            Interrupt

          Synch Type               None

          Usage Type               Data

        wMaxPacketSize     0x0004  1x 4 bytes

        bInterval              12

        bMaxBurst               0

Hub Descriptor:

  bLength              12

  bDescriptorType      42

  nNbrPorts             6

  wHubCharacteristic 0x000a

    No power switching (usb 1.0)

    Per-port overcurrent protection

  bPwrOn2PwrGood       10 * 2 milli seconds

  bHubContrCurrent      0 milli Ampere

  bHubDecLat          0.0 micro seconds

  wHubDelay             0 nano seconds

  DeviceRemovable    0x00

 Hub Port Status:

   Port 1: 0000.02a0 5Gbps power Rx.Detect

   Port 2: 0000.02a0 5Gbps power Rx.Detect

   Port 3: 0000.02a0 5Gbps power Rx.Detect

   Port 4: 0000.02a0 5Gbps power Rx.Detect

   Port 5: 0000.02e0 5Gbps power Polling

   Port 6: 0000.02a0 5Gbps power Rx.Detect

so if I understand correctly there is some error within an internal usb hub.

So I wonder if there is a way to simulate some kind of reset that would make the device to register again, without manipulating the usb cable.

This could also be helpful to remotely mount the device for example.

Thanks

This is a bit old, but I just needed the answer and found it elsewhere.

First, copy your hub device name from error messages. In your case, 0000:00:14.0

Then, as root, do the following:

echo 0000:00:14.0 >> /sys/bus/pci/drivers/xhci_hcd/unbind

echo 0000:00:14.0 >> /sys/bus/pci/drivers/xhci_hcd/bind

And presto: The hub is reset and you can continue using.

I've been dealing with this bug for some years now. I'm not sure if it is a kernel issue, or a hardware issue (my main suspicion). But at least now I don't need to reboot just to reset the USB hub.

Hope this helps someone.