headphone jack dosen't work on laptop on F11... any ideas?

[David Lam]

running 2.6.29.5-191.fc11.x86_64 on my hp pavillion laptop,  when I plug in
headphones I expect for the speakers to be muted and sound to come in the
headphones, but I find there isn't any affect-- namely, sounds till comes
from the speakers and no sound in the headphones just as if I hadn't plugged
them in, in the first place.

anyone experience/fix something like this before?
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