[alsa-devel] Constant noise on HDA ALC275

[Takashi Iwai]

At Mon, 08 Oct 2012 14:46:24 +0200,
Julien Danjou wrote:
> 
> [1  <multipart/mixed (7bit)>]
> [1.1  <text/plain (quoted-printable)>]
> On Mon, Oct 08 2012, Takashi Iwai wrote:
> 
> > At best, please give alsa-info.sh outputs at both working and
> > non-working cases.  In that way, we can see the internal states more
> > exactly than ambiguous descriptions.
> 
> Sure! Both attached.
> 
> The diff between background-noise and no-background-noise is:
> 
> --- /tmp/alsa-info-background-noise.txt	2012-10-08 14:41:05.880816525 +0200
> +++ /tmp/alsa-info-no-background-noise.txt	2012-10-08 14:42:24.700814459 +0200
> @@ -3,7 +3,7 @@
>  !!ALSA Information Script v 0.4.61
>  !!################################
> 
> -!!Script ran on: Mon Oct  8 12:41:05 UTC 2012
> +!!Script ran on: Mon Oct  8 12:42:24 UTC 2012
>  
>  
>  !!Linux Distribution
> @@ -198,7 +198,7 @@
>    Control: name="Beep Playback Switch", index=0, device=0
>      ControlAmp: chs=3, dir=In, idx=4, ofs=0
>    Amp-In caps: ofs=0x17, nsteps=0x1f, stepsize=0x05, mute=1
> -  Amp-In vals:  [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80]
> +  Amp-In vals:  [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x00 0x00]
>    Connection: 5
>       0x18 0x19 0x1a 0x1b 0x1d

It's interesting.  So, _unmuting_ the input from NID 0x1d removes the
noise?  (0x80 means the channel is muted.)


Takashi