[alsa-devel] Help wanted: emachines em350 internal mic

Eliot Blennerhassett ewblen+alsadevel at gmail.com
Tue Nov 30 07:56:04 CET 2010


There is only a single mic on this netbook. However, the alsa device
shows up as stereo, and the right channel carries an inverted copy of
the left channel.

So when the two channels are summed to make a mono (e.g. for
telephony, or playback on mono internal speaker) it appears that there
is no signal.

Is there a way to "cure" this problem in the driver?  I can think of
* Force internal mic capture to be mono (left only)
* Copy left to right capture
* Invert right capture
but don't know how easy any are to implement.

Note more info about this 'card' can be found attached to

thanks and regards


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