From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Pablo N. Hess" Subject: HDA Conexant: is mic boost possible? Date: Tue, 04 Sep 2007 11:14:58 -0300 Message-ID: <46DD6862.6070400@linuxnewmedia.com.br> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail.linuxnewmedia.com.br (mail.linuxnewmedia.com.br [189.14.98.138]) by alsa0.perex.cz (Postfix) with ESMTP id 142F9103954 for ; Tue, 4 Sep 2007 16:19:12 +0200 (CEST) Received: from endeavour.linuxnewmedia.com.br (c9534038.virtua.com.br [201.83.64.56]) by mail.linuxnewmedia.com.br (Postfix) with ESMTP id E0FB23800C54 for ; Tue, 4 Sep 2007 11:22:44 -0300 (BRT) Received: from localhost (localhost.localdomain [127.0.0.1]) by endeavour.linuxnewmedia.com.br (Postfix) with ESMTP id DA33EFF2E for ; Tue, 4 Sep 2007 11:18:53 -0300 (BRT) Received: from endeavour.linuxnewmedia.com.br ([127.0.0.1]) by localhost (endeavour [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 20785-01-2 for ; Tue, 4 Sep 2007 11:18:50 -0300 (BRT) Received: from [192.168.1.176] (unknown [192.168.1.176]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by endeavour.linuxnewmedia.com.br (Postfix) with ESMTP id 21FA5FF22 for ; Tue, 4 Sep 2007 11:18:39 -0300 (BRT) 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 I have to make the sound chip of a Itautec W7635 (= FIC VA250D) work on a Gentoo(-based) distro (I'm now trying Sabayon). It is a HDA-intel (Conexant codec). Using my earphones as a stereo mic, recording with 'arecord -f cd' has always worked perfectly fine, from alsa-driver-1.0.14 on. However, when using a regular mono mic (like the ones that come in common headsets), recording simply does *not* work. Here's the quick info: alsa-driver-1.0.14: playback: ok recording: stereo mic: ok mono mic: no input at all (very high volume already tried) alsa-driver-1.0.15rc1: playback: ok (even better than with alsa-driver-1.0.14) recording: stereo mic: ok (seems better thatn with alsa-driver-1.0.14) mono mic: *very* very low volume, bad quality, lots of low-volume noise, too. Now the paragraphed info: Playback is perfectly ok since alsa-driver-1.0.14, just like recording with an earphone as a stereo mic. With alsa-driver-1.0.14, definitely no mono-mic input works, no matter the settings at alsamixer. With alsa-driver-1.0.15rc1, mono-mic input works very very bad (extremely low volume, terrible quality, lots of clicks and noise). I guess that the mono mic needs a mic boost in alsa-driver-1.0.15rc1. However, with a 'grep -i "mic boost" .../pci/hda/*.c' (alsa-driver-1.0.15rc1 source code), it seems that only patch-realtek.c and patch-analog.c support this feature. Is it even possible to add a mic boost feature to this codec? The output of alsa-info.sh with alsa-driver-1.0.15rc1 is at: http://pastebin.ca/681023 Thanks a lot for any info, and congratulations to all of you for your terrific work with ALSA. Pablo Hess