#StackBounty: #sound #pulseaudio #alsa #headphones Headphone Sound Output Gets Mixed with the Line-Out Output

Bounty: 100

Problem Summary

When the line-out speaker is selected as the sound output, the sound
is fine. Sound comes only from the speakers connected to the line-out port. However, when the headphone is selected as the output device,
sound comes out both from the headphone and the speakers.

Details

My desktop computer has three sound output options:

  • HDMI/Display port (not used)
  • Headphone port at the front (headphone
    connected)
  • Line-out port at the back (speakers connected)

When line-out is selected as the output device, the sound is
heard only from the speakers connected to the line-out port. No problem there.

enter image description here

However, when headphone is selected as the output device, the sound is
heard both from headphones and the speakers connected to the line out
port.

enter image description here

This is really strange and beats the very purpose of the headphone,
namely, privacy and not disturbing others.

Current Settings

My sound card as found is as follows.

sudo aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC3234 Analog [ALC3234 Analog]

rest snipped

I even tried setting the sound volume of the line-out to zero in
settings. This works for the line-out speakers. However, this does not
seem to have any effect on the sound volume when the headphone is
selected. The line-out speakers are equally loud, even with the sound volume set to zero.

enter image description here

I am not sure whether the output from alsamixer will be useful. But
here it goes anyway.

enter image description here


Get this bounty!!!

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