Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761077AbZCQAwh (ORCPT ); Mon, 16 Mar 2009 20:52:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754192AbZCQAw1 (ORCPT ); Mon, 16 Mar 2009 20:52:27 -0400 Received: from mail-fx0-f176.google.com ([209.85.220.176]:48012 "EHLO mail-fx0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753454AbZCQAw0 (ORCPT ); Mon, 16 Mar 2009 20:52:26 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:from:to:cc:in-reply-to:references:content-type:date :message-id:mime-version:x-mailer:content-transfer-encoding; b=t/6FpgYFZVZQjsoBs7T4kjo3Lyn6cR2PiuykEqbbAMIMHeM+ZVOkUCaE/weGFsGbo0 +FiAovh2Yyb0PqAVB04t8IaisEtKmORc61C1ibBBbEE5yzUPl1y74i8yYL3qG7fGv4zw gYUjwze/EEhLpkoMFM5Wk0k2rLf4FXuFzqu3I= Subject: Re: [alsa-devel] Bugs on aspire one A150 From: Maxim Levitsky To: Andreas Mohr Cc: Takashi Iwai , linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org, Kernel Testers List In-Reply-To: <20090316212227.GA29471@rhlx01.hs-esslingen.de> References: <20090316160208.GB4458@rhlx01.hs-esslingen.de> <20090316170015.GA9776@rhlx01.hs-esslingen.de> <20090316173000.GA25647@rhlx01.hs-esslingen.de> <20090316180638.GB25647@rhlx01.hs-esslingen.de> <20090316212227.GA29471@rhlx01.hs-esslingen.de> Content-Type: text/plain Date: Tue, 17 Mar 2009 02:52:19 +0200 Message-Id: <1237251139.7952.1.camel@maxim-laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.24.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1738 Lines: 50 On Mon, 2009-03-16 at 22:22 +0100, Andreas Mohr wrote: > Hi, > > On Mon, Mar 16, 2009 at 09:28:39PM +0100, Takashi Iwai wrote: > > At Mon, 16 Mar 2009 19:06:38 +0100, > > Andreas Mohr wrote: > > > I just tried connecting a headset and switching to E-Mic. > > > What I can say is: > > > - opposite levels does NOT happen there (E-Mic is "analog micro"-based, right?) > > > - leaving E-Mic unplugged will actually record from i-Mic (due to properly > > > working EAPD mechanism, right?) > > > > The record from mic-jack is via analog path. The phase-inversion > > appears only for digital-mic, AFAIK. > > Thought so. > > > > One question still: is this a hardware defect (i.e. could this possibly > > > be swapped cables of the microphone connector in this model or so? > > > Not plausible but...), or is this an existing property > > > of the HDA's dig-mic base? You indicated it's the latter I think... > > > > My guess is that it's a hardware implementation. > > Maybe for the noise suppression via mic array. > > Not sure what this means. > > > The question is whether the left / right channels recorded from > > digital mic are really raw data, or they are for modified data > > (for differential, etc)... It's hard to guess without the actual > > data. > > I don't quite follow you here. Is there anything I could do about this? > > Thanks, > > Andreas What about exposing the i-mic as a mono only device to userspace? It is mono after all? Best regards, Maxim Levitsky -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/