[alsa-devel] Constant noise on HDA ALC275

Takashi Iwai tiwai at suse.de
Fri Sep 21 15:07:52 CEST 2012

At Fri, 21 Sep 2012 14:43:19 +0200,
Julien Danjou wrote:
> On Fri, Sep 21 2012, Takashi Iwai wrote:
> Hi,
> >> I've an HDA based chipset in a new Sony Vaio Z (Ivy Bridge). As sound as
> >> the system starts and the sound module are loaded, there's a constant
> >> noise (shhhhhhht) in the speakers. The noise change a bit if I toggle
> >> the mute button, but it's still there.
> >> 
> >> This noise stops as sound as I plug something in the jack port.
> >
> > Do you mean the headphone, or any jacks no matter input or output?
> Anything, external speaker, headphones with or without mic. When I plug
> something, the noise from the speaker just stops.
> I just discoveredtThere's an exception: if a jack is plugged, and if I
> set "Auto-Mute mode" to "disabled" in alsamixer the noise can be heared.
> If I set "Auto-Mute mode" back to "enabled", no more noise.

Well, it means that the noise disappears when the speaker pin is
disabled.  It's logical.

But my question was: if you plug to an external mic jack and leave the
headphone jack, the speaker noise is still there, right?

> > Also do you get the noise from the headphone output?
> Never. It's really only the integrated speakers emitting something.
> > In anyway, please give alsa-info.sh output (run with --no-upload
> > option).  This will cover more wide range of information.
> Attached.

Turning EAPD on/off on node 0x14 makes difference?


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