Hi, 
There is a workaround for this issue, though it differs a bit depending on the 
model of the computer.
I too have a Lenovo SL510, and just managed to solve it. Just open the Alsa 
config file with "sudo gedit /etc/modprobe.d/alsa-base.conf", and add the line 
"options snd_hda_intel model=quanta", to the end of the file. In both cases the 
commands should be without the quotation marks. Now just restart the computer 
and the speakers mute when headphones are plugged in.

-- 
Headphone jack sense missing on Realtek ALC269
https://bugs.launchpad.net/bugs/580006
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