I have Ubuntu 10.10 installed on my Asus G50VTX5. Sound works for the speakers but there's no sound from the headphones. Headphones are working fine in other devices.
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Headphone: Make and model? USB or plugged into sound card? – Mar 21 '11 at 12:45
5 Answers
This is a pulseaudio bug, still present on 11.10
As a workaround edit /usr/share/pulseaudio/alsa-mixer/paths/analog-output-headphones.conf :
gksu gedit analog-output-headphones.conf
Than search for and comment this line like here:
[Jack_InputDevice]
#code = Headphone
Save the file and close gedit. Than restart pulseaudio with:
pulseaudio -k
Most people think this is an ALSA thing, but is not.
I reported this bug: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/921397

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I wasn't able to edit the file and I struggled quite a bit trying to figure out why. I thought it was because of pixmap as I was getting an error message. I installed
sudo apt-get install gtk2-engines-pixbuf
error message was gone, but still not able to edit so I used the following command
gksudo gedit /usr/share/pulseaudio/alsa-mixer/paths/analog-output-headphones.conf
and there I was able to
I still get an error message everytime I save regarding a root file that does not exist, but it doesn't look like it's impeding the save process at all.
its an issue! I've opened a bug about this issue but canonical didnt give much attention. athough I've managed to put Headphones working
I've explained how to solve on page's bug report https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/660715
Open a terminal end type:
alsamixer
Play around with the bars. Use arrows to switch left-right or up/down to higher/lower the volume.

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Your headphone output is probably muted. Open the sound control panel and check that you don't have any outputs muted.

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Downvoted because?? I've had this problem, and it was exactly the case that my headphone output was muted. Not saying it's the answer every time, but worth checking. – djeikyb Mar 28 '11 at 06:01