I have ubuntu 13.04 on my laptop (HP Pavilion dv6-2171ee) and whenever i plug my headphones sound gets played from both the laptop's built in speakers and headphones. I tried adjusting the settings in alsamixer but the problem remaind. I also tried adding to /etc/modprobe.d/alsa-base.conf file lines that i found on the internet. I found on the internet that i might fix this problem using gnome-alsa mixer but whenever i open it, the application doesn't launch, i tries installing it from different sources and running it from terminal but it didn't work. Any ideas how to fix this?