How to Prevent Keyboard Backlight from Turning On at Boot

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.

Sources:
1. https://bugs.launchpad.net/dell-sputnik/+bug/1510344/comments/46
2. https://askubuntu.com/questions/700069/keyboard-backlight-turns-on-after-lock-screen-display-on

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