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

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Date:	Tue, 17 Mar 2009 17:18:28 +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 Tue, Mar 17, 2009 at 12:25:13PM +0100, Takashi Iwai wrote:
> At Tue, 17 Mar 2009 11:47:55 +0100,
> Andreas Mohr wrote:
> > > Fortemedia device names include FM2018-380, not sure yet which one is in
> > > Aspire One.
> > > 
> > > http://www.fortemedia.com/products/index.htm
> > > ( especially http://www.fortemedia.com/products/fm1182.htm )
> > 
> > http://www.wpgholdings.com/event/S/SACg_04_ForteMedia_SAM.pdf
> > mentions "FM201x" and www.sacg.com.tw (this one could be useful!).
> > Searching Google "FM201[0-9] Fortemedia" comes up with FM2010 and
> > FM2018 and thus
> > http://www.hengdasheng.com.cn/uploadfile/391/cfile/2008102414057847.pdf
> > which is a relatively informative datasheet.
> 
> I'm not sure whether FM2018 is on a netbook.  Rather my guess is it's
> a digital-mic component by FortMedia together with their software
> library for SAM handling.

I had the same thoughts later. Since they use an extensive SAM handling
library, there probably isn't such a chip, otherwise they probably
wouldn't need it ;)
Could you thus implement a nice beam-forming sound evaluation SAM
library for ALSA pretty pretty please? ;)
...or, is that SAM library available to us given that it exists in the
factory install? If so, then one should probably make good use of it...

> BTW, a simple "fix" for the mono capture problem, you can patch
> the config file for HD-audio in alsa-lib like below.  Then the first
> channel will be used for mono capture instead of averages.
> Give it a try.
> 
> (But, this won't fix programs that prefer "hw" access such as
>  pulseaudio, of course.)

I'm not *quite* sure whether this is really what you meant,
but I patched /usr/share/alsa/cards/HDA-Intel.conf (libasound2
1.0.18-1ubuntu7) in exactly this way and then did
arecord -Dplughw:0 -fdat -c1 test.wav; aplay test.wav
but well, with equal slider positions there was no audio again.

Andreas
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