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

[Takashi Iwai <tiwai@suse.de>]

At Tue, 17 Mar 2009 17:18:28 +0100,
Andreas Mohr wrote:
> 
> 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? ;)

A patch 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...

An easy one would be a relatively simple algorithm, but I don't know
whether any free library code.  Better to ask on LAD.

> > 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.

Don't use -Dplughw:0.  Then the default setup will be used.

	% arecord -fdat -c1 test.wav


Takashi