[alsa-devel] Constant noise on HDA ALC275

[Takashi Iwai]

At Fri, 21 Sep 2012 15:14:35 +0200,
Julien Danjou wrote:
> 
> [1  <text/plain (quoted-printable)>]
> On Fri, Sep 21 2012, Takashi Iwai wrote:
> 
> > But my question was: if you plug to an external mic jack and leave the
> > headphone jack, the speaker noise is still there, right?
> 
> Oh. If I understand correctly you're talking about 2 jacks, but there's
> only one jack on this laptop, doing both mic and speaker.

I see.

> > Turning EAPD on/off on node 0x14 makes difference?
> 
> Yes, turning it off makes the noise disappear. But I can't hear
> anything, e.g. playing music makes no sound unless I turn it back on. :)
> 
> (note that this may be obvious to you, but I don't understand what's
> EAPD on 0x14 so I'm just explaining what I hear ;-)

It's something like:
	hda-verb /dev/snd/hw0D0 0x14 SET_EAPD 0x00
to turn off, and
	hda-verb /dev/snd/hw0D0 0x14 SET_EAPD 0x02
to turn on.

Also, try to mute all sources in NID 0x0b,
	hda-verb /dev/snd/hw0D0 0x0b SET_AMP 0x7480

Takashi