Keyboard light keeps turning on after login and / or unlock

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Ok, I figured out the fix, at least for me, hopefully other people will benefit. This is a bug with UPower. In order to fix it, you need to edit the file

/etc/dbus-1/system.d/org.freedesktop.UPower.conf.

You need to change:

send_interface="org.freedesktop.UPower.KbdBacklight"/>```

To

```<deny send_destination="org.freedesktop.UPower"
       send_interface="org.freedesktop.UPower.KbdBacklight"/>```

Finally you should reboot.  This should fix the problem.  This was recently fixed in unity-settings daemon but needs to be fixed in the mate-settings daemon: https://bugs.launchpad.net/dell-sputnik/+bug/1510344
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