Headphone warning light on on MacBook Pro

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http://askubuntu.com – I don't know if this problem happened when I installed Ubuntu before. Recently I noticed that when I boot Ubuntu, the warning light in the Headphone port automatically switches on. Warning light means "Something wrong in the headphone port". Although my headphone is working in Ubuntu. I've heard that the headphone contains some magical "switch" that will fix the warning light problem. So I poked the headphone port with chopsticks, pens, paper clips, even my finger, and the warning light still stays on. I don't have this problem in OSX. How do I switch the light off? (HowTos)