[alsa-devel] hda-intel: ALC1150 (alc882 patch) produces constant noise on line-out port

[Takashi Iwai]

On Wed, 01 Jun 2016 20:23:58 +0200,
Maximilian.ammann wrote:
> 
> Hello,
> 
> I experienced weird behaviour on my "ASUS MAXIMUS VII RANGER" which has
> a realtek soundcard with the ALC1150 codec. The problem is that if the
> patch_882 is enabled I get a constant noise on the line-out port.
> I started experienced and noticed that when using the generic model the
> problem disappeared. Therefore the problem also disappeared when
> removing the folowing line in sound/pci/hda/patch_realtek.c:
> 
> HDA_CODEC_ENTRY(0x10ec0900, "ALC1150", patch_alc882),
> 
> I really would like to know whether this behaviour is expected or how I
> (myself) could fix it by creating a patch.
> 
> alsa-info.sh output:
> Without alc882 patch:
> http://www.alsa-project.org/db/?f=3fdf926c64a02273e0e68035eeb94282ca44a
> 7df
> With alc882 patch:
> http://www.alsa-project.org/db/?f=336755aab10811bb0af5440dbda7b9cda3d9b
> 116
> 
> Thansk in advance, if possible it would be awesome if you could provide
> me some tips since I really would like to fix it myself as my very
> first patch.

Did you try to turn off "Loopback Mixing" mixer switch?  This often
stops such a noise.


Takashi