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[Warren <1425803@xxxxxxxxxxxxxxxxxx>]

In scouring the internet I have found references to similar matter with bsd. Seems maybe the xhci driver folks maybe haven't quite got around to supporting non-root USB 3.0 hubs.
http://netbsd.2816.n7.nabble.com/Help-USB-3-0-xHCI-driver-does-not-support-non-root-hub-td308329.html

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https://bugs.launchpad.net/bugs/1425803

Title:
  Driver problem with USB chipset VIA VL812-B2

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Presuming the system info you need is in the automatically generated
  collection from ubuntu-bug. Ubuntu 14.10, fully updated. Kernel
  3.16.0-31-generic.

  The problem described also exists in earlier kernels although I cannot
  say when it first appeared.

  I have a HooToo HT-UH005 4-Port USB 3.0 hub (VIA VL812-B2 chipset) .
  I'm using it with a HP Pavilion 17-e049wm laptop. This computer has
  two USB 3.0 ports.

  When the computer is quiescent the CPU consumed is normally 0% to 1%.
  That's the same whether there are USB 2.0 or 3.0 devices plugged into
  its onboard USB 3.0 ports, or not.

  As soon as I plug the HT-UH005 hub into one of those USB 3.0 ports, a
  system process khubd appears and it takes about 7% of CPU. Also,
  several "kworker" and "ksoftirqd" threads appear which between them
  consume another 18% of CPU, for a total of 25% CPU load. That's just
  because the HT-UH005 was plugged in. No peripherals attached to the
  HT-UH005.

  Stranger still, when I unplug the HT-UH005 the khubd, kworker, and
  ksoftirqd threads *continue* to consume 25% CPU. That's with the HT-
  UH005 disconnected after it was previously connected. This goes on
  indefinitely. The only way I can get things back to normal is to
  reboot or to manually stop and restart (unbind and then bind) the
  xhci_hcd driver that's servicing the internal hub that runs the
  computer's two USB 3.0 ports.

  The listing from dmesg shows no apparent problems when the HT-UH005 is
  connected or disconnected. Listing from lsusb shows the HT-UH005
  successfully connected to a port on the internal USB 3.0 hub using
  driver xhci_hcd.

  This could be caused by some sort of incompatibility between the AMD
  internal hub and the VIA external hub. But, that the condition
  persists after the HT- UH005 is disconnected suggests it is almost
  surely a linux driver problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-31-generic 3.16.0-31.41
  ProcVersionSignature: Ubuntu 3.16.0-31.41-generic 3.16.7-ckt5
  Uname: Linux 3.16.0-31-generic x86_64
  NonfreeKernelModules: wl fglrx
  ApportVersion: 2.14.7-0ubuntu8.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  warren     5539 F.... pulseaudio
   /dev/snd/controlC0:  warren     5539 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Feb 25 22:12:53 2015
  HibernationDevice: RESUME=UUID=d6ce9a82-d272-4efa-bfe4-e13c883b2418
  InstallationDate: Installed on 2012-05-23 (1008 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: Hewlett-Packard HP Pavilion 17 Notebook PC
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-31-generic root=UUID=515bfe03-1a57-4762-9cc1-6896e081c4c5 ro quiet splash rootfstype=ext4 vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-31-generic N/A
   linux-backports-modules-3.16.0-31-generic  N/A
   linux-firmware                             1.138.1
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/04/2013
  dmi.bios.vendor: Insyde
  dmi.bios.version: F.31
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 1984
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 01.13
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnInsyde:bvrF.31:bd12/04/2013:svnHewlett-Packard:pnHPPavilion17NotebookPC:pvr0880100003305B10000620100:rvnHewlett-Packard:rn1984:rvr01.13:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: HP Pavilion 17 Notebook PC
  dmi.product.version: 0880100003305B10000620100
  dmi.sys.vendor: Hewlett-Packard

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