Features:
+* When a Type=forking service fails and needed another service that
+ service is not cleaned up again when it has StopWhenUnneeded=yes
+ http://lists.freedesktop.org/archives/systemd-devel/2013-July/012141.html
+
* backlight: properly handle multiple backlight devices for the same
hardware: at shutdown we should only save the backlight setting for
the "best" way to access the backlight. Strategy should be: at