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[Launchpad Bug Tracker <1454108@xxxxxxxxxxxxxxxxxx>]

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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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: ehci hp probook usb
-- 
HP Probook 450 usb ehci breaks between 3.13.0-36 and 3.13.0-37
https://bugs.launchpad.net/bugs/1454108
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