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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1455376

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1455376

Title:
  USB3 boot device lost during system boot: "xhci_hcd 0000:04:00.0:
  Error while assigning device slot ID"

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Booting Ubuntu 15.04 amd64 kernel "Linux version 3.19.0-16-generic
  (buildd@komainu) (gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu13) )
  #16-Ubuntu SMP Thu Apr 30 16:09:58 UTC 2015" on a Samsung RF711-S08
  laptop (Sandy Bridge) from a USB3 stick connected to the USB3 port on
  the righthand side, the boot stalls at the Ubuntu splash screen (with
  the dots), with the USB3 stick LED showing no activity, eventually
  dropping to the initramfs console. If I unplug and replug the USB3
  stick during the stall period, the LED shows activity and the boot
  proceeds.

  The same USB3 stick boots on another laptop without any problems.

  Excerpts from dmesg:

  Recognition of the USB3 port:

  [    1.643737] xhci_hcd 0000:04:00.0: xHCI Host Controller
  [    1.643741] xhci_hcd 0000:04:00.0: new USB bus registered, assigned bus number 2
  [    1.646775] usb usb2: New USB device found, idVendor=1d6b, idProduct=0003
  [    1.646777] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
  [    1.646778] usb usb2: Product: xHCI Host Controller
  [    1.646780] usb usb2: Manufacturer: Linux 3.19.0-16-generic xhci-hcd
  [    1.646781] usb usb2: SerialNumber: 0000:04:00.0
  [    1.646886] hub 2-0:1.0: USB hub found
  [    1.646895] hub 2-0:1.0: 2 ports detected

  Failure to initialize the USB3 device:

  [    1.847589] xhci_hcd 0000:04:00.0: Error while assigning device slot ID
  [    1.847597] xhci_hcd 0000:04:00.0: Max number of devices this xHCI host supports is 32.
  [    1.847600] usb usb2-port1: couldn't allocate usb_device

  Replugged the USB3 device during the boot stall:

  [   13.861689] usb 2-1: new SuperSpeed USB device number 2 using xhci_hcd
  [   13.881832] usb 2-1: New USB device found, idVendor=0951, idProduct=162b
  [   13.881844] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
  [   13.881850] usb 2-1: Product: DT HyperX 3.0
  [   13.881855] usb 2-1: Manufacturer: Kingston
  [   13.881860] usb 2-1: SerialNumber: *********************
  [   13.885561] usb-storage 2-1:1.0: USB Mass Storage device detected
  [   13.885829] scsi host6: usb-storage 2-1:1.0
  [   13.885901] usbcore: registered new interface driver usb-storage
  [   13.887130] usbcore: registered new interface driver uas

  I assume the bug is at 1.847589.

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