F14 mplayer doesn't adjust brightness in X, nouveau

[stan]

I'm having a problem with mplayer in F14 x86_64.  mplayer doesn't allow
the use of the 3 and 4 keys to adjust brightness during playback in X
with nouveau, though it works in the console.

When I used it in F12 with the nv driver, it worked just fine in X.

Would this be a problem in mplayer or nouveau?  Or ???

Wondering if anyone knows how to fix this or what I should report this
as a bug against.

Thanks.