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

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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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