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[Launchpad Bug Tracker <1454108@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

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

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https://bugs.launchpad.net/bugs/1454108

Title:
  HP Probook 450 usb ehci breaks between 3.13.0-36 and 3.13.0-37

Status in linux package in Ubuntu:
  Expired

Bug description:
  Release: Ubuntu 14.04.2 LTS
  Package version: linux-image-3.13.0-37-generic
  What expect to happen: USB to work after boot-up
  Whap happened instead: dead USB, no dmesg messages when unplugging or plugging in USB devices.

  HP Probook 450 USB support got broken since 3.13.0-37. Ubuntu 14.04.2
  LTS

  Similar but not identical to problems as described in https://bugs.launchpad.net/bugs/1072918.
  All USB ports dead. dmesg shows ehci_hcd died. cleaning up.

  By passing extra kernel parameters using grub menu:
  ehci=noirq (or was that acpi=noirq) makes it work but that breaks onboard ethernet.
  also tried with tried iommu=soft (didn't work)

  Tried all kernel images from 3.13.0-37 to 3.13.0-52 .. all the same
  result: broken USB.

  had to back-step to 3.13.0-36 ...

  Just thought I'd mention, that might affect other HP Probook models as
  well.

  kernel modules affected: xhci_hcd, hid_generic, usbhid, ehci

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