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[Michael Steenbeek <1242321@xxxxxxxxxxxxxxxxxx>]

Same problem here, on an Acer Aspire V3-571G. The problem happens with both 14.04 and 14.10 (other versions not thoroughly tested).
Putting USB2 devices in the USB3 ports works.
Putting USB3 devices in the USB2 ports works.
Putting USB2 devices in the USB2 ports works.

Putting USB3 devices in the USB3 ports doesn't work. Copying files to
USB3 external hard drives connected to a USB3 port will almost always
fail after about 10 seconds. Also, I sometimes get a kernel panic when
using the USB3 port on my laptop (both with USB2 and USB3 devices),
which might be related.

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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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