Thank you Luke!
I added ubuntu-audio-dev ppa,  installed those packages and rebooted.
It works now!
When I plug in my headset, speakers get muted and I can hear sound on my 
speakerphones.
But unfortunately my internal microphone doesn't work any more. External 
microphone works when I plug it in.
For me this is not a problem because I use headsets with external microphone.
So for me the problem is solved.
I can finally listen music in public places!

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Sound simultaneously  on headphones and speakers - Lenovo IdeaPad u350
https://bugs.launchpad.net/bugs/477226
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