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[ramaboo <david@xxxxxxxxxxx>]

I have a similar problem on a macbook 3.1 with ubuntu 8.04 beta. if my
headphones are plugged into when the computer is turned on then the
sound comes out the speakers instead of headphones. If i unplug the
headphones and plug them back in everything works as it should.

-- 
macbook 3.1: Internal speakers don't silence when headphone socket is used
https://bugs.launchpad.net/bugs/205059
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Support, which is the registrant for Mactel Support.

Status in Mactel Support: New
Status in Source Package "alsa-driver" in Ubuntu: New

Bug description:
I have a MacBook 3,1 and when I connect headphones or speakers to the headphones socket, audio comes out of the headphones and the MacBook's internal speakers.

I suppose this means that the function of switching from speakers to headphones is software or firmware controlled.