I updated my Ubuntu from 11.10 to 12.04 and for my unhappiness, the sound wasn’t working.
Made a lot of tests until I realized that it was not working just the phone jack from the FRONT panel of the computer. When using by the back panel, everything was normal…
WTF?!?!?! How to solve it?
Researching through Google, saw a lot of suggests and none worked for me… then I saw someone saying to use alsamixer through terminal.
Opened the terminal, typed alsamixer and pressed ENTER. Tried some configurations with the main controls as I did before on the GUI, to see if something was going to happen, but the sound didn’t worked yet.
Then I pressed the right arrow and saw an option called Loopback Mixing. It was turned off, then I turned on. “TCHARAAAAAAMMMMMM”
Took a super punch at my ears because my volume was on max… but my problem was solved.
Here stays the tip! Hope it solves for you guys too (in case you have the same problem).