Select HDMI audio output when headphone connectted

In Snow Leopard, I can connect my headphone to Mac Mini, and select HDMI audio output when I want sound from monitor, or select headphone.
But in Lion, I can not select HDMI when headphone is connectted, so I have to plug/unplug headphone very often, quite anoyying...
How can I disable this feature?
Thanks.

I've just started a thread regarding this exact issue, but in Mountain Lion.  Did you ever solve it?  Or, if you have upgraded to Mountain Lion, do you still experience it?
EDIT: Almost exactly 1 year later you get a response. lol.

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    Solved!
    Go to Solution.

    hi cmilkosk,
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    Cheers!
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