Brightness control?

[Beartooth]

	I put a launcher (whose "about" link calls it "xfce4-brightness-
plugin 1.2.0," and points to http://goodies.xfce.org) onto a Fedora.xfce 
panel.

	The image looks like the helm pf a ship, with a large red circle 
in the middle, containing a white exclamation point. Sure enough, 
hovering the mouse cursor over it gets a message saying "No device 
found", and left-clicking it does nothing. Right-clicking gets a grey box 
with the top line (saying "Brightness plugin") grayed out.

	Is there in fact a brightness control in Fedora xfce? How do you 
invoke it?

-- 
Beartooth Staffwright, Neo-Redneck Not Quite Clueless Power User
Remember I have precious (very precious!) little idea where up is.