05.02.2015 02:13, Shawn Starr wrote:
Hello ALSA devs,
I spoke to patrakov on Freenode from the #Alsa IRC channel and they mentioned that the noise background I am experiencing is not normal. I tried two different headsets, both headsets have two separate jacks, the same result.
I will test any patches/quirks for kernel as needed.
Here is the alsa-info:
http://www.alsa-project.org/db/?f=29d3c45e2d66c58be03a10bd0186067a9d735a11
I am not an expert on Intel HDA cards, but... some microphones are picky about the reference voltage supplied by the soundcard. You can change this temporarily, for debugging purposes, with hda-analyzer. See general instructions at
http://www.alsa-project.org/main/index.php/HDA_Analyzer
Note: it needs the "snd-hwdep" module loaded, and needs to be run as root.
In your case, you need to select Node[0x18] PIN in the left pane, and, at the bottom of the right pane, select 50 or 100 instead of 80 in the VREF box. See https://imgur.com/F84raSN for a screenshot based on your alsa-info.
If this doesn't help, just click around randomly. Maybe you'll find the magic checkbox that makes the noise go away and the voice stay :) - if that happens, please email the resulting diff file that hda-analyzer creates.