linux-kernel - Re: [alsa-devel] Bugs on aspire one A150

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Message-ID: <20090316212227.GA29471@rhlx01.hs-esslingen.de>
Date:	Mon, 16 Mar 2009 22:22:27 +0100
From:	Andreas Mohr <andi@...as.de>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Andreas Mohr <andi@...as.de>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: [alsa-devel] Bugs on aspire one A150

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
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