post the output of arecord -v test.wav
Mono will be selected when you do not specify channel there is a bug in pulseaudio when downmix from stereo to mono http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/?id=ff4af902cf4ac07c5f1da3b6dacbb3195c7c222d you can try mute one of the channels of the "capture switch" to work around this bug alsamixer -c0 or amixer-c0 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1100232 Title: [SBC-FITPC2, Realtek ALC662 rev1, Blue Line In, Rear] Recording has crackeling noise To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1100232/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
