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Issue: External USB3 drive (Seagate GoFlex 3TB) fails to mount, but is
initially recognized by the kernel. See attached CurrentDmesg.txt for
error. External drive formatted as ext4. Same unit works as expected on
USB2 ports.

Expected behaviour: I expect my external USB3 drive to be recognized by
the OS when plugged into a USB3 port, AND I expect it to operate at USB3
speeds.

OS details:
Ubuntu 3.13.0-24.46-generic 3.13.9
Description:    Linux Mint 17 Qiana
Release:        17

Motherboard details:
Gigabyte GA-990FXA-UD3 motherboard
-rev. 4.0
-BIOS version F2 (latest at time of writing)
-USB controller - VIA VL805 "Support various Linux kernels":
http://www.via-labs.com/en/products/vl805/index.jsp

UEFI/BIOS set to enable legacy USB support and both XHCI and EHCI
handoff to OS (enabling or disabling these has no effect). IOMMU enabled
or disabled has no effect. Hardware IOMMU enabled (I think) with kernel
boot parameters "iommu=pt iommu=1" modified in "/etc/default/grub".

Same/similar bugs for Linux Mint reported here:
https://bugs.launchpad.net/linuxmint/+bug/1332722
https://bugs.launchpad.net/linuxmint/+bug/1348669 (Duplicate of this bug 
report, but kept for reference)

Same/similar bugs for Ubuntu (various releases) reported here:
https://bugs.launchpad.net/ubuntu/+bug/1242321
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/966248
https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/843764
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/775543

** Affects: ubuntu
     Importance: Undecided
         Status: Confirmed


** Tags: apport-collected external port qiana usb3
-- 
External USB3 device does not work in USB3 port
https://bugs.launchpad.net/bugs/1353050
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