From mboxrd@z Thu Jan 1 00:00:00 1970 From: plessas@mur.at (Peter Plessas) Subject: via82xx DC offset at -30dB Date: Mon, 29 Oct 2007 01:44:34 +0100 Message-ID: <20071029004434.GD32311@mur.at> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from fox.mur.at (fox.mur.at [89.106.208.7]) by alsa0.perex.cz (Postfix) with ESMTP id E6CA7249D4 for ; Mon, 29 Oct 2007 01:44:37 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by fox.mur.at (Postfix) with ESMTP id A6FC74BDBD for ; Mon, 29 Oct 2007 01:44:37 +0100 (CET) Received: from fox.mur.at ([127.0.0.1]) by localhost (fox.mur.at [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 29814-02-3 for ; Mon, 29 Oct 2007 01:44:35 +0100 (CET) Received: from hornet.mur.at (hornet.mur.at [89.106.208.12]) by fox.mur.at (Postfix) with ESMTP id 247EA4B98A for ; Mon, 29 Oct 2007 01:44:35 +0100 (CET) Content-Disposition: inline List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org Dear List, having a Compaq Presario notebook in front of me, running Debian testing and a 2.6.18-4-686 kernel, i have a strange DC offset when trying to record audio via the mic/line input. As the audacity level meters suggest, it resides at -30dBFS. Audio comes through and gets recorded though, but the offset severely limits the headroom of course. The sensitivity of the line/mic input seems to be quite high, although i have the mic boost setting turned off of course. Setting the module option ac97_quirk=yes did not help either. Can it be that a soundcard of this strange behavior is manufactured, or is it an alsa/driver issue? I really don't want to install another M$ operating system to check if it works there, so any help is deeply appreciated. lspci lists the device as: 00:07.5 Multimedia audio controller: VIA Technologies, Inc. VT82C686 AC97 Audio Controller (rev 20) regards, PP PS: please CC: me, as i am not subscribed to alsa-devel (yet)