From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Henningsson Subject: Re: Bug#701498: hda: Internal mic does not work on Thinkpad T420s (CX20590 codec) Date: Mon, 25 Feb 2013 07:16:28 +0100 Message-ID: <512B01BC.2090206@canonical.com> References: <20130223194257.7554.82839.reportbug@katniss.segie> <1361735995.27602.118.camel@deadeye.wl.decadent.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from youngberry.canonical.com (youngberry.canonical.com [91.189.89.112]) by alsa0.perex.cz (Postfix) with ESMTP id 5085526514F for ; Mon, 25 Feb 2013 07:16:30 +0100 (CET) In-Reply-To: <1361735995.27602.118.camel@deadeye.wl.decadent.org.uk> 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: Ben Hutchings Cc: alsa-devel@alsa-project.org, Adrian Lang , 701498@bugs.debian.org List-Id: alsa-devel@alsa-project.org On 02/24/2013 08:59 PM, Ben Hutchings wrote: > On Sat, 2013-02-23 at 20:42 +0100, Adrian Lang wrote: >> Package: src:linux >> Version: 3.2.35-2 >> Severity: normal >> >> There are two microphones in alsamixer and Gnome 3 audio settings (i. e., >> pulseaudio), but I can't get any sound using either of them. I think that's the >> same problem as reported to [openSUSE] and [Ubuntu]. >> >> The problem persists with 3.7 (3.7.8-1~experimental.1) from >> experimental. >> >> [openSUSE] >> http://forums.opensuse.org/english/get-technical-help-here/laptop/469210-opensuse-12-1-cannot-get-internal-mic-work-lenovo-g770-laptop.html >> [Ubuntu] >> https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/938644 These are different bugs as they concern different hardware. > I happen to have a Thinkpad T420 with the same audio codec, and the > internal mic works fine. (There does seem to be a problem with external > mics, now that I check, but let's ignore that for now.) So this is more > board-specific, not chip-specific, behaviour. Ok. For the internal mic, this could be the cancelling out problem; see the "Inverted Internal Mic" section of this blog post [1] for more information. ...as these bugs can sometimes be very specific - when the factory finally assembles the laptop, they might select a different component just for the DMIC, that has this problem. -- David Henningsson, Canonical Ltd. https://launchpad.net/~diwic [1] http://voices.canonical.com/david.henningsson/2012/05/22/three-audio-bugs-in-12-04/