Hi, it's me again.  Workaround I used is putting on Sound
Preferences/Output/Connector to "Analog Headphones".  And "mute" on
alsamixer/Speaker.

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[Lenovo IdeaPad Y550A] Subwoofer don't mute/unmute on plugging external 
acoustics
https://bugs.launchpad.net/bugs/611803
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