Constant noise in speakers and headphones

Question

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.

Cees Timmerman · Answer

That's an open bug. Disabling automute in alsamixer keeps the hiss so it's easier to ignore.

BartBog · Answer

I had this problem and solved it by disabling "loopback" in alsamixer. 
(open alsamixer, and disable the rightmost control)

wyliechee · Answer

The problem goes away after disabling the Auto-Mute mode. Run alsamixer in the terminal, scroll to the right and press up/down to enable or disable Auto-Mute mode

Kavya Gokul · Answer

The most probable cause of constant noise coming in from the speakers is usually mic boost. In order to disable this:

Open a terminal.
Type alsamixer and press Enter.
Reduce the Mic Boost and Internal Mic Boost to zero. Refer to screenshot.

Constant noise in speakers and headphones

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