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It worked normal one day, but then I turned the computer on, and suddenly only one the left speaker works. Headphones work normally.

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Have you verified that it is not a hardware problem? –  Nanne Oct 28 '12 at 14:15
    
Try a livecd and figure out if it is the hardware or it has something to do with Ubuntu –  Jeggy Oct 28 '12 at 14:20

2 Answers 2

UBUNTU 14.04 LTS

I faced the same problem, only one speaker was working. I tried everything I could get my hands on. But the solution was rather simple

I used the following command in the terminal

alsamixer

Then In the mixers I noticed that on everything except the master volume the green-white bars were half I increased them to full and then the bars became full and my problem was solved. It seems that only one channel is open by default.

VERY WEIRD, WHY WOULD YOU DO THAT,
Any way, Thanks Ubuntu "jazakAllah khair"

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Maybe your speaker is not balanced properly.

  1. Open "System Settings" (via the Dock/Switcher/whatever you call it :P on the left or opening the dash, typing "System Settings" and opening the one with the Gear-and-Wrench icon)
  2. Select "Sound"
  3. Once opened, stay on the "Output" tab. Look at the first slider, one labeled "Balance".
  4. Move the slider to the middle, indicated by a line.
  5. Close the window and the System Settings window
  6. Play a video or a sound clip to see if it worked.
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