From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Alexander E. Patrakov" Subject: Re: [Intel HDA][ALC3226] Too much white noise from microphone Date: Fri, 06 Feb 2015 16:48:09 +0500 Message-ID: <54D4A9F9.6090709@gmail.com> References: <8841801.KiuVFG1hDJ@segfault> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-lb0-f171.google.com (mail-lb0-f171.google.com [209.85.217.171]) by alsa0.perex.cz (Postfix) with ESMTP id 220AA2605BB for ; Fri, 6 Feb 2015 12:48:14 +0100 (CET) Received: by mail-lb0-f171.google.com with SMTP id u14so17380612lbd.2 for ; Fri, 06 Feb 2015 03:48:12 -0800 (PST) In-Reply-To: <8841801.KiuVFG1hDJ@segfault> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: Shawn Starr Cc: "alsa-devel@alsa-project.org" List-Id: alsa-devel@alsa-project.org 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. -- Alexander E. Patrakov