From mboxrd@z Thu Jan  1 00:00:00 1970
From: Takashi Iwai <tiwai@suse.de>
Subject: Re: Grey noise with HDA Intel PCH
Date: Thu, 14 Aug 2014 16:09:51 +0200
Message-ID: <s5h7g2bnowg.wl-tiwai@suse.de>
References: <20140814114003.7b0019f3@saldaea> <53EC8D5B.5020709@ladisch.de>
 <20140814124616.65991d7e@saldaea> <s5hoavnnu38.wl-tiwai@suse.de>
 <20140814160737.0e8fc283@saldaea>
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To: Julian Wollrath <jwollrath@web.de>
Cc: alsa-devel@alsa-project.org, Clemens Ladisch <clemens@ladisch.de>
List-Id: alsa-devel@alsa-project.org

At Thu, 14 Aug 2014 16:07:37 +0200,
Julian Wollrath wrote:
> 
> > > > > Simple mixer control 'Mic',0
> > > > >   Front Left: Playback 0 [0%] [-34.50dB] [on]
> > > > >   Front Right: Playback 0 [0%] [-34.50dB] [on]
> > > > 
> > > > This plays any noise from the mic input.
> > > Turning it off makes no difference since capture is turned off
> > > anyway:
> > 
> > This is a loopback mixer element, it has nothing to do with capture
> > stream.
> > 
> > The likely culprit of the static noises is the signal from the analog
> > loopback.  In some cases, you can disable the whole loopback via
> > "Loopback Mixing" mixer element on the fly.  In some cases, you'd need
> > to disable each mixer input (e.g. "Mic Playback Switch").
> > In some cases (e.g. on some Sony and Dell laptops), you'd need to
> > disable the complete analog loopback at the initialization.
> > 
> > The last one can be done via the early patching or sysfs
> > reconfiguration, pass "mixer_nid = 0" hint.  See HD-Audio.txt for a
> > brief instruction.
> Sadly, that did not help.

Give alsa-info.sh output after your change to verify whether you did
correctly.


Takashi