laptop noise (was Re: [linux-audio-user] intel core 2 duo and amd turion 64x2)

Jerome Tuncer columbiatwo at
Sat Mar 10 21:23:08 EST 2007


My definite solution for such a noise on my old ASUS L2000D was simply 
to not provide the computer with its earth connection when plugged. I 
first used a tiny piece of plastic bag to isolate the earth connection 
from the pin of the wall plug to the mains cable but eventually I built 
a custom mains cable (connection from wall plug to switching power 
supply box) with earth pin not connected.

I do not have anymore noise in audio output (I used to have in both 
internal chipset and USB interface...)

Hope it works for you and you're not too concerned about strict 
electrical security (-:



Eric Dantan Rzewnicki a écrit :
> On Sat, Mar 10, 2007 at 10:56:41PM +0300, Dmitry Baikov wrote:
>> On 3/10/07, Eric Dantan Rzewnicki <eric at> wrote:
>>> Is there anything I can try to do to get rid of the noise when plugged
>>> into power?
>> Possibly it's a ground loop.
>> Sometimes, reversing power plug (i.e. swapping zero and phase pins) of
>> the offending device (in your case either one monitor or the laptop)
>> helps.
> Hmm ... I'm not all that knowledgeable about electricity, but I thought
> ground loops happened when you had two different paths to ground. i.e.
> ... devices connected to 2 different circuits. But, again, I don't
> really know what I'm saying here.
> -Eric Rz.

More information about the Linux-audio-user mailing list