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Possible Duplicate:
Sound comes out of my speakers even when headphones are plugged in

How can I mute the speakers when the headphones are plugged in?

I have searched all over the internet and although there are many threads that discuss this, none has worked for me.

I have tried alsamixer and installing linux-backports-modules-alsa-lucid-generic, but neither worked. The Speakers just wont mute when I plug in the headphones. I had this problem in 11.04 and hoped it would be one of the headaches to go away when I downgraded to Lucid Lynx.

cat /proc/asound/card0/codec#* | grep Codec
Codec: Realtek ALC665
Codec: Intel CougarPoint HDMI

Model Name: Alienware M14xR1 (PS: I am not a gamer so I have no attachment to Windows :) )

$ lspci | grep -i audio
00:1b.0 Audio device: Intel Corporation Cougar Point High Definition Audio Controller (rev 05)
    $ sudo lshw -c sound
           description: Audio device
           product: Cougar Point High Definition Audio Controller
           vendor: Intel Corporation
           physical id: 1b
           bus info: pci@0000:00:1b.0
           version: 05
           width: 64 bits
           clock: 33MHz
           capabilities: pm msi pciexpress bus_master cap_list
           configuration: driver=HDA Intel latency=0
           resources: irq:50 memory:da800000-da803fff
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marked as duplicate by Nitin Venkatesh, Octavian Damiean, James Feb 24 '12 at 18:59

This question was marked as an exact duplicate of an existing question.

please add to your question lspci | grep -i audio and sudo lshw -c sound - can you confirm that you are now using lucid? – fossfreedom Aug 19 '11 at 17:07
@fossfreedom I confirm that I am using Lucid. I have added the results in my question. – yayu Aug 20 '11 at 1:40

Did you see the answers to this question? There are a million ways of wiring these audio chips, so can you please add the model name of your laptop? Also have a look at this bug. You need to find the right model, maybe this list helps.

Lucid is a year older than your Sandy Bridge laptop, so I guess it would be better if you install 11.04 or wait two months and install 11.10.

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Alienware M14xR1. Added in the question. – yayu Aug 19 '11 at 16:05
Natty had a gazillion other problems, plus I hated Unity. It also appeared to me that classic Gnome was not high on the priority list for the devlopers at the moment, so I just deleted and reinstalled Lucid. I am also waiting for October. – yayu Aug 19 '11 at 16:11

I don't know how you could automatically do this but while you are waiting for a permanent solution assigning amixer sset Speaker toggle to a keyboard shortcut should help you.

  • To do this open system -> preferences -> keyboard shortcuts
  • Click on add
  • Give it a name and paste the above command
  • Assign a shortcut to the command.

You could also turn your speakers off from the sound menu

  • In the sound menu go to output
  • In the drop down menu (connectors) select speakers
  • Click on the mute checkbox
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