Solved:
Plz install the following package by changing the appropriate version of
ubuntu in the following line.
sudo apt-get install linux-backports-modules-alsa-lucid-generic
You may need to update /etc/modprobe.d/alsa-base.conf with
options snd-hda-intel model=ideapad
More details can be found in the below link
http://www.paralaptop.com/ubuntu/fix-ubuntu-10-04-lucid-lynx-headphone-
jack-sense-problem.html
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https://bugs.launchpad.net/bugs/374915
Title:
Headphones do not work, built-in speakers do
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