Joseph, I just tested the kernel you asked me to and the problem still exists 
with
Linux mana 3.18.0-031800rc1-generic #201410192135 SMP Mon Oct 20 01:37:04 UTC 
2014 x86_64 x86_64 x86_64 GNU/Linux

I made an interesting observation though:
When I ran 3.13.0-36 and performed a reboot into 3.18-rc1 without power down 
everything worked fine.
(boot 3.13.0-36, reboot into 3.18-rc1, suspend, resume => usb is alive)

However, if I do a complete shutdown and then boot into 3.18-rc1, usb us dead 
after resume.
(power on, boot into 3.18-rc1, suspend, resume => usb is dead)

I've tried each way to boot twice.

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

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https://bugs.launchpad.net/bugs/1384041

Title:
  [Dell Precision M3800] USB is dead after resume from sleep

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