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I installed a vanilla version of Ubuntu 14.04 (Desktop, 64-bit) on my Lenovo Thinkpad W540. The sound works well on the built-in speakers, but I get no sound from the headphone jack. In the sound settings, I can see my headphones as an available option, and I know it's not muted. When I toggle the mute box, I can hear a little "dit" coming through the headphones as the audio feed is being disabled/enabled. But no sounds that are sent to the headphone output is actually coming out.

I will say that when I plug in the headphones, the internal speakers mute. But I cannot figure out why I'm getting no sound.

Attached is a screen-shot of my alsa-mixer: alsamixer screen-shot

I do find it a bit odd that there are two entries for the headphones. Are there any suggestions or anyone else with a similar problem?

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What struck me odd was that Linux Mint (live) had the headphone jack working properly. This led me to look into the /proc/asound/ directory, which I discovered was not being created at start up.

After digging around for this error, I found that by running the following installation command:

sudo apt-get install linux-sound-base alsa-base alsa-utils

I rebooted and the headphone jack worked! I'm not sure why these were not installed by default, but the /proc/asound/ directory is now there and I no longer have any issues.

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