[Bug 412862] Re: AOD250 microphone problem

[Seano]

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

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AOD250 microphone problem
https://bugs.launchpad.net/bugs/412862
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