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[Warren <1425803@xxxxxxxxxxxxxxxxxx>]

This bug occurs with more than just one chipset. For chuckles I picked
up a 7-port USB 3.0 hub that uses GenesysLogic 3520 (maybe 3521)
chipsets. *SAME PROBLEM*.

I can confirm that this problem occurs with more than just the VIA
VL812-B2 chipset. How many different chipsets, who knows. The VIA and
GenesysLogic chipsets are the most popularly used for external hubs. It
may well be the case that the xhci_hcd does not well handle the
situation of USB 3.0 external hubs plugged into USB 3.0 internal hubs on
a wide level. Probably the title of this bug report should be changed.

It smells like when an external USB 3.0 hub is plugged into the port of
an internal USB 3.0 hub, the khubd process goes into spinlock and never
comes out.

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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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