I've just fixed this problem with following way; 1. I installed Alsa Driver Modules, sudo add-apt-repository ppa:ubuntu-audio-dev/ppa sudo apt-get update sudo apt-get install linux-alsa-driver-modules-$(uname -r) 2. Edit alsa-base.conf and add "options snd-hda-intel model=ideapad" to the end of options snd** lines (it doesn't matter, just paste where you want), gksudo gedit /etc/modprobe.d/alsa-base.conf add "options snd-hda-intel model=ideapad" save and close Then your laptop needs to be restarted to effect this change. Now, when I switched to headphone, I don't hear sound on laptop and headphone simultaneously. On 6 December 2010 14:29, kayno