https://bugzilla.novell.com/show_bug.cgi?id=740118
https://bugzilla.novell.com/show_bug.cgi?id=740118#c5
--- Comment #5 from Takashi Iwai 2012-01-10 14:45:08 UTC ---
The mono-recording problem is likely because the laptop has a digital-mic of
ForteMedia. It's a stereo d-mic and it's known to send a reverse-phased signal
in one channel, thus summing stereo to mono results in almost nothing but
background noises.
Unfortunately there is no good workaround for this as long as you use
PulseAudio and mono recording. Just try recording in stereo, or use
ALSA-native directly (hw:0 or such) instead of "default" in the applications if
possible.
I can put the patch to 12.1 kernel as clearly it's a bug. The patch will be
sent to both upstream and stable kernels, so the change won't be lost.
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