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[Lemon Squid <ubuntuone@xxxxxxxxxxxxxx>]

Interesting twist for me:

I recently had to upgrade the motherboard, power supply, and case on the
machine that was having the issue (USB 3.0 external disk having to be
powered off and powered on after a reboot before the OS would "see" it).
I was lazy and didn't bother reinstalling the OS (Ubuntu 14.04 LTS).

The main differences:

- The new MB has USB 3.0 support and the USB 3.0 external drives are
plugged in to that rather the the PCI-e card I had previously been
using.

- CPU went from Intel to AMD

- Bigger power supply (600W vs 400W)

The problem no longer occurs. My wild guess is that it was the PCI-e
card causing the problem OR the driver for USB 3.0 on PCI-e is wonky and
the issue got resolved because the motherboard did not use the same
drivers (not an expert on this kind of issue).

Just thought I'd post this to add another wild stab in the dark.

-- 
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1242321

Title:
  USB 3.0 Harddrive not recognised

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu is not recognising any device plugged into any USB 3.0 ports.
  Sometimes Ubuntu will freeze for a few seconds when you plug something
  into a USB 3.0 port; when Ubuntu comes out of the freeze, the device
  is still NOT recognised.

  No problems with USB 2.0 ports and devices.

  The USB 3.0 on this computer only works in Windows 7 (I'm dual booting
  Ubuntu 13.10 and Windows 7, both are 64-bit).

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