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

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Date:	Mon, 16 Mar 2009 15:42:54 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Andreas Mohr <andi@...as.de>
Cc:	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

At Mon, 16 Mar 2009 15:31:58 +0100,
Andreas Mohr wrote:
> 
> Hi,
> 
> On Mon, Mar 16, 2009 at 03:18:20PM +0100, Takashi Iwai wrote:
> > At Mon, 16 Mar 2009 14:30:01 +0100,
> > Andreas Mohr wrote:
> > > 
> > > Hi,
> > > 
> > > On Mon, Mar 16, 2009 at 01:09:50PM +0100, Takashi Iwai wrote:
> > > > The question in the top priority is whether it's a kernel driver
> > > > issue or alsa-lib converter issue.  Could you check whether the sounds
> > > > recorded with -Dhw (and with matching rate, format, etc) have the same
> > > > noise problem at first?
> > > 
> > > OK, tried arecord -v -D hw:0 -c1 test.wav, which ended with
> > > arecord: set_params:961: Sample format non available
> > > .
> > > 
> > > arecord -v -D hw:0 -c1 -f S16_LE test.wav then ended with
> > > arecord: set_params:966: Channels count non available
> > > thus completing it into a
> > > arecord -v -D hw:0 -c2 -f S16_LE test.wav
> > > worked.
> > > 
> > > Trying this line with plughw then worked (of course, since two channels
> > > never has any problems).
> > > 
> > > Interestingly when using plughw there seems to be some LPF effect, since
> > > with hw I get lots of white noise whereas with plughw the recorded sound
> > > is dark (no higher-frequency components at all).
> > > 
> > > And audio is always being recorded properly no matter which Capture
> > > sliders position.
> > >
> > > To state it more clearly, both hw and plughw have no issues whatsoever
> > > with -c2 -f S16_LE, any sliders position.
> > > If I then switch to plughw:0 -c2 -f U8 (IOW change to U8 format),
> > > no problems either. Trouble starts if I then change to -c1 and have
> > > both channel sliders about equal (if they're not equal then I'm getting
> > > audio returned properly).
> > 
> > So, the following is also problematic
> > 
> > 	% arecord -fdat -c1 -Dplughw ng.wav
> > 
> > while the below works?
> > 
> > 	% arecord -fdat -Dhw good.wav
> 
> Indeed, the above has problems with problematic slider positions whereas
> the below never has.

Err, could you be more specific about "slider positions"?


> > > > And, if it's about the alsa-lib conversion problem, we can reproduce
> > > > without the hardware, e.g. via file plugin...
> > > 
> > > So, what to do?
> > 
> > Does the conversion by sox from good.wav to a mono-channel file work?
> 
> I assume I should be using
> sox good.wav -c1 good1.wav
> ?
> 
> If so, yes, this works, audio is there.

Just to be sure - what about below?
	sox good.wav -c1 good1.wav mixer 0.5,0.5


Takashi
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