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[Warren <1425803@xxxxxxxxxxxxxxxxxx>]

Kernel 4.0-rc2 tested. Problem remains.

In rc2 there was a minimal fglrx driver in the kernel so I was able to
get a more usual desktop and use the graphical system monitor app. The
manifestation of the problem is slightly different now. Total CPU usage
still goes to 24 - 25% when a USB 3.0 hub is plugged in, but the khubd
process does not seem to take excessive CPU time. Instead, the kworker
and ksoftirqd processes take it all up. The kworker thread(s) take in
total about 17% and the ksoftirqd thread(s) about 7%.

The problem remains the same in all other aspects. It is present with
hubs using the VIA or Genesyslogic chipsets. Excessive CPU usage
continues even after the external hubs are disconnected. The cure
remains to unbind and then bind the xhci_hcd driver serving the internal
USB 3.0 hub.

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

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Title:
  Driver problem with USB chipset VIA VL812-B2

Status in linux package in Ubuntu:
  Confirmed

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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