Comment 53 for bug 1668129

> This bug is still present on 14.04 using linux-generic-lts-xenial kernel 4.4.0-87-generic.

Sorry, I misread your statement - unless you have edited your udev rule to enable the hotplug memory, you should not encounter this issue using Trusty with either the 3.13 or 4.4 kernel. If you are, I suggest you check your udev rule (comment 29).