fixed by adding following line:
options snd-hda-intel position_fix=1 model=lenovo
in /etc/modprobe.d/alsa-base
now internal speakers go mute when jack in headphones. Toshiba satellite a200 
(https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/115637/comments/10)
(https://wiki.ubuntu.com/LaptopTestingTeam/ToshibaSatelliteA200-130)

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headphones on laptop don't mute laptop speakers on Toshiba A120-237
https://bugs.launchpad.net/bugs/115637
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