From mboxrd@z Thu Jan 1 00:00:00 1970 From: Colin Guthrie Subject: Re: wrong decibel data? Date: Sat, 03 Apr 2010 11:09:33 +0100 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from lo.gmane.org (lo.gmane.org [80.91.229.12]) by alsa0.perex.cz (Postfix) with ESMTP id 29389243FB for ; Sat, 3 Apr 2010 12:10:52 +0200 (CEST) Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1Ny0J9-0000eB-3M for alsa-devel@alsa-project.org; Sat, 03 Apr 2010 12:10:27 +0200 Received: from cpc1-sgyl30-2-0-cust258.sgyl.cable.virginmedia.com ([94.173.13.3]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 03 Apr 2010 12:10:27 +0200 Received: from gmane by cpc1-sgyl30-2-0-cust258.sgyl.cable.virginmedia.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 03 Apr 2010 12:10:27 +0200 In-Reply-To: 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 'Twas brillig, and Nicolo' Chieffo at 02/04/10 21:25 did gyre and gimble: > I just had a discussion with pulseaudio developers in which they told > me that if the speakers don't emit any audio when the ALSA volume is > 0%, then the correct gain value should be -inf dB (a value lower than > -200 for pulseaudio means mute). Unfortunately my card has -48 dB. > > They also said that if with -47.25 dB (which is what I get with ALSA > volume set to 2%) I can hear audio even if it's very very low, at -48 > dB I should still be able to hear something (the scale is > logarithmic). > > Their request is to change to -200 the gain reported from my card > driver when the ALSA volume is set to 0%. > Thanks FWIW, I've got the same/similar h/w with a cutoff at 14% in PA as you have. I've been meaning to get this fixed for a while, but I'm incredibly lazy with certain things that don't bother me practically, so haven't followed it up yet. Thanks for getting the ball rolling :) If any specific debug is needed here, feel free to ask. Col -- Colin Guthrie gmane(at)colin.guthr.ie http://colin.guthr.ie/ Day Job: Tribalogic Limited [http://www.tribalogic.net/] Open Source: Mandriva Linux Contributor [http://www.mandriva.com/] PulseAudio Hacker [http://www.pulseaudio.org/] Trac Hacker [http://trac.edgewall.org/]