Did this issue start happening after an update/upgrade?  Was there a
prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.8 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as
"Confirmed".


Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.8-rc6


** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1624479

Title:
  xhci_hcd dont assign usb port to ipod shuffle 2 generation

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Linux 4.4.0-36-generic #55-Ubuntu SMP Thu Aug 11 18:01:55 UTC 2016
  x86_64 x86_64 x86_64 GNU/Linux

   When you insert ipod suffle docker into usb you can see into syslog
  (tail -f /var/log/syslog )

  Sep 16 18:42:39 lenovin kernel: [ 4686.969690] usb 1-3: new high-speed USB 
device number 64 using xhci_hcd
  Sep 16 18:42:40 lenovin kernel: [ 4687.266269] usb 1-3: new high-speed USB 
device number 65 using xhci_hcd
  Sep 16 18:42:41 lenovin kernel: [ 4688.676394] usb 1-3: new high-speed USB 
device number 71 using xhci_hcd
  Sep 16 18:42:41 lenovin kernel: [ 4688.972868] usb 1-3: new high-speed USB 
device number 72 using xhci_hcd
  Sep 16 18:42:42 lenovin kernel: [ 4689.517711] usb 1-3: new high-speed USB 
device number 74 using xhci_hcd
  .......... till you disconect the ipod, but it's never mounted (really it is 
never associate a usb port )

     At another notebook, with uses ehci-pci (Linux kernel
  4.4.0-22-generic i686 ) all ok

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