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lsb_release -rd
Description:	Ubuntu 14.04.3 LTS (up-to-date packages)
Release:	14.04

USB3-plugged devices do not function early in the boot process. This
includes USB2 devices plugged into USB3 ports, but does not include USBx
devices plugged into USB2 ports (these work fine).

To reproduce:
1. plug keyboard into USB3 port, computer off
2. boot
3. attempt to select options in the GRUB menu

Observed outcome:
Selection of boot options is not possible

Expected outcome:
Selection of boot options is possible

Also, a few people have noticed that they can't boot from media plugged
into their USB3 ports, for example a flash drive with a Live CD image on
it. (e.g. http://ubuntuforums.org/showthread.php?t=1628665)

I guess this has something to do with whether the usb3 drivers are
available at this early stage of boot: later on, after the full kernel
is loaded, USB3 works fine.

I know I could plug my keyboard into a USB2 port as it was before, but I
have these new monitors that have got only USB3 ports on them, and it's
physically more convenient to plug keyboard & mouse into them than the
workstation itself (Dell T7600), which is a bit far for the cables to
reach.

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

-- 
USB3 devices are not active early in boot
https://bugs.launchpad.net/bugs/1536555
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