I have HP Pavilion laptop with two jack outs for audio and both of them work if only one is plugged in. If both of jacks are used, then in only one headphones set there is a sound. I would like to have sound on both of them, so for example two people can listen the same thing on their own headphones.
I'm working on Ubuntu 10.04 and my sound card is:
Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)