The audio output presents noise both on the front headphone output and on the 
rear speaker port.
The noise disappears if i mute the outputs and the noise level is controlled by 
the alsamixer "Master" and 
"Front" levels. It does't change with the PCM slider. every other slider 
availbale is set to minimum and 
doesn't affect the level.
Now I have installed Xubuntu 11.10 but I had the same problem with xubuntu 
10.04.
In windows there is no noise.

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https://bugs.launchpad.net/bugs/896821

Title:
  [System Product Name, Realtek ALC889, Green Line Out, Rear] Background
  noise or low volume

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