How to make the headphone socket work with ubuntu 9.10 and Macbook 2,1

I've been having this issue for sometime now and never realized that the solution is pretty simple. Whenever I plug-in a headphone into the headphone-socket on my macbook running Ubuntu 9.10, it never worked. Assuming that there was some problem with the headphone I continued using the speakers. However, the headphone worked on my other OSs.

One fine day, curiosity got the better of me and I wanted to sort this out. It didn't take me a long time to find a solution. This issue was already raised in the Ubuntu forums and has worked for many people. Click here to find out.

Just run the command 'alsamixer' (without the quotes) in terminal and press the key 'm' (without the quotes again). The default setting for the headphone jack is muted and one just has to unmute it.