This issue affected me with a new Dell E5470 on 14.04
The issue would go away with a factory reset but after doing updates it
would reappear.
The way I eventually got it fixed was
Step 1: as stated above
Edit 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"/>
Step 2: Bios
In my bios file I had to find the settings for the keyboard timeout and
change it to something else. So if it was set to 5 seconds then I had
to change it to 10 seconds. If it was set to 10 seconds then I had to
change it to 5 seconds.
Once I rebooted my system the keyboard returned to the expected
behavior.
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https://bugs.launchpad.net/bugs/1510344
Title:
Keyboard Backlight Turns on at boot
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