On my laptop, Samsung 300V5A-S19 I have the constant noise from the speakers. If I wear headphones, the sound becomes more pronounced (at half volume it mutes the music). The noise level is independent of the volume control. The noise disappears only when volume is completely muted. For the record, the sound is reminiscent of the noise of the waves or something like that.
System information: Ubuntu 12.10, kernel 3.5.0-18
Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 04)
All packages in the system updated.
PS: Following the advice from this message (click) yielded no result.