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I am using Dell Alienware M14X. I have installed Ubuntu 14.04 on my laptop. The problem that I am facing is that the audio plays only through speakers all the time even I though I plug in my headphone.

When I go to sound settings, it is showing me headphones in the "play sound through" which means that my system is able to detect the headphones; But just the audio doesn't play through the headphones, instead it still plays through speaker.

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Run the following command into the Terminal:

gksudo gedit /etc/modprobe.d/alsa-base.conf

Scroll down and add these lines to the end of the file:

#Keep snd-pcsp from being loaded as first soundcard
options snd-pcsp index=-2
alias snd-card-0 snd-hda-intel
alias sound-slot-0 snd-hda-intel
options snd-hda-intel model=dell-m6-amic

Then, save , reboot and test sound using headphones and speakers.

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    Hi Tharindu. I did whatever you have said but with no luck. Thanks for your reply though. – JItendra Jun 7 '14 at 5:19
  • Okay, then go back to the previous method and remove the lines added by you, and press Alt+Ctrl+T to open up the terminal and type alsamixer and hit Enter. You'll be greeted with a semi-UI that looks much like a mixer (imagine that!). Chances are, you will see a muted channel somewhere in that. Use the left and right arrow keys to highlight the muted channel, and press the M key to unmute it. – Tharindu Jun 7 '14 at 5:27
  • Thanks man. HP/Speakers auto detect was off in alsamixer. I turned it on and boom!! the audio started coming through my headphones. – JItendra Jun 7 '14 at 15:30
  • I also have the Alienware. When bringing up alsamixer I enabled the HP/Speakers. But I can not change the volume from 00 – StephenBoesch Mar 12 '16 at 2:02

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