Comment 10 for bug 412862

I have the same thing on both of my Acer Aspires one D250 using alc272
codec
I was able to work around it either with a special asoundrc coding or by
seperating
the L & R channels with pulseaudio and making one or the other less in
signal strength.
Originally I was unable to get sound from the microphone but a fix was made
and put into
the alsa drivers but this particular issue remains. I am currently using
Mandriva 2010 and
this issue is present and I have tested Ubuntu 10.4.1 in a live session with
pavucontrol am
able to duplicate this same issue and same workaround.

On Mon, Aug 23, 2010 at 1:45 PM, Seano <email address hidden> wrote:

> Apologies for double posting but I found a few minutes to do some more
> testing. I have an Acer Aspire One 532h which has exactly the same
> symptoms i.e internal mic doesn't work until there is a level difference
> between right and left.
>
> Not only is there a polarity reversal but working around this by
> reducing one input fader to zero is creating excessive noise because the
> phase cancellation is happening somewhere in digital and reducing the
> fader is not the same as muting the channel. I can further confirm this
> because an external signal (1KHz tone in this case) connected to only
> left or right with both faders the same, works fine and is clean
> compared to the fader down solution but the same source is suffering
> from cancellation when applied to both channels ( great for vocal
> removal :-) )
>
> The scary thing is that installing pavucontrol and pulling the fader
> down has been offered all over the internet as a solution when in fact
> it's a poor workaround for one situation only.
>
> Symptoms are the same with version 1.0.23 of alsa installed.
>
> Sean
>
> --
> AOD250 microphone problem
> https://bugs.launchpad.net/bugs/412862
> You received this bug notification because you are a direct subscriber
> of a duplicate bug (378806).
>

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