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[Alexander Sack <asac@xxxxxxxxxx>]

Shortly after I saw this on my thinkpad I saw the same problem also on a
non-linux machine connected to the same USB hub. I wrote this problem
off to be a hardware issue of my USB hub and bought a new one and
haven't seen this problem since...

Thanks again and sorry for not updating you earlier.

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https://bugs.launchpad.net/bugs/1250966

Title:
  [Lenovo ThinkPad X220] usb port turns itself off

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  1 USB Hub with 4 ports, the hub is powered. Since recent kernel the hub suddenly powers of the ports and i need to replug it. I have connected:
   - keyboard
   - mouse
   - yubikey
   - webcam (not in use)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.12.0-2-generic 3.12.0-2.7
  ProcVersionSignature: Ubuntu 3.12.0-2.7-generic 3.12.0
  Uname: Linux 3.12.0-2-generic i686
  ApportVersion: 2.12.6-0ubuntu1
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  asac       5544 F.... pulseaudio
   /dev/snd/controlC0:  asac       5544 F.... pulseaudio
  Date: Wed Nov 13 19:03:11 2013
  HibernationDevice: RESUME=UUID=1ee02b29-e1dc-4974-8efb-9b20cf8f19de
  MachineType: LENOVO 4286CTO
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.12.0-2-generic root=UUID=092c7391-4af6-423f-8498-5a03021b8bb7 ro quiet splash pcie_aspm=force i915.i915_enable_rc6=1 vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.12.0-2-generic N/A
   linux-backports-modules-3.12.0-2-generic  N/A
   linux-firmware                            1.117
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2013-11-09 (4 days ago)
  dmi.bios.date: 05/18/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET46WW (1.16 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4286CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr8DET46WW(1.16):bd05/18/2011:svnLENOVO:pn4286CTO:pvrThinkPadX220:rvnLENOVO:rn4286CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4286CTO
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO

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