From mboxrd@z Thu Jan 1 00:00:00 1970 From: Julian Wollrath Subject: Re: Grey noise with HDA Intel PCH Date: Thu, 14 Aug 2014 16:07:37 +0200 Message-ID: <20140814160737.0e8fc283@saldaea> References: <20140814114003.7b0019f3@saldaea> <53EC8D5B.5020709@ladisch.de> <20140814124616.65991d7e@saldaea> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mout.web.de (mout.web.de [212.227.17.11]) by alsa0.perex.cz (Postfix) with ESMTP id B83B526163C for ; Thu, 14 Aug 2014 16:07:45 +0200 (CEST) In-Reply-To: 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: Takashi Iwai Cc: alsa-devel@alsa-project.org, Clemens Ladisch List-Id: alsa-devel@alsa-project.org > > > > 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. Cheers, Julian