This workaround worked for me on a Dell Latitude E7450 Ubuntu 16.04
kernel 4.6 RC 4

In the file:
/etc/dbus-1/system.d/org.freedesktop.UPower.conf
change:
    <allow send_destination="org.freedesktop.UPower"
           send_interface="org.freedesktop.UPower.KbdBacklight"/>
to:
    <deny send_destination="org.freedesktop.UPower"
           send_interface="org.freedesktop.UPower.KbdBacklight"/>

and reboot.
Source: 
https://askubuntu.com/questions/700069/keyboard-backlight-turns-on-after-lock-screen-display-on

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https://bugs.launchpad.net/bugs/1510344

Title:
  Keyboard Backlight Turns on at boot

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