Recently find out, this is not alsa problem, but pulseaudio problem.
When I boot without pulseaudio, microphone as well as switching between
headphones and speakers works fine.
When I start pulseaudio demon then the problems are back. I will file new bug
against pulse audio.
** Changed in: alsa-driver (Ubuntu)
Status: New => Invalid
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sound comes also from speakers when headphones plugged in and mic is not working
https://bugs.launchpad.net/bugs/664730
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