It was added for some workloads, but ill-suited and never really
got traction. Using cgroups to manage the resources of particular
services (using systemd), or something separate like rtkit is
a better bet.
Add a new DBus interface based on the QoS one to provide for controlling a
keyboard backlight via the Linux leds interface.
Signed-off-by: Richard Hughes <richard@hughsie.com>