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I normally use a mini jack cable to connect the audio out of my laptop to my guitar amp to listen to music.

When the computer is on battery I have no problem whatsover with the sound quality. However, the second I plug in the charger to the laptop I get a lot of noise in the guitar amp.

I have Windows 7 on dual boot and this problem doesn't happens there, which allows me to conclude that this is software problem of some sort.

Any idea how to solve it? Thanks.

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I had the same problem in a Samsung notebook, I couldn't find a solution, So I updated from 9.04 to 10.04. The noise while charging was gone. But maybe you should try another thing before doing this, it's a little too drastic ;)

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Thanks for your reply. I already am running Ubuntu 11.10, so I guessed the problem would have been fixed by now.. Any other idea? – nunos Feb 7 '12 at 10:28

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