Howto mute

Question

11

Mute sound on Headphone unplug?

rated 0 times [ 11] [ 0] / answers: 1 / hits: 9298 / 1 Year ago, wed, may 24, 2023, 1:27:35

Is there a way of muting sound from my computer everytime I unplug my headphones (Like a phone does) to stop sound then playing out of my speakers?

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etzelmortg

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3 Years ago

answered 1 Year ago darpose · Accepted Answer

Howto detect an unplug

Basically what worked for me was:

# When plugged in:

cat /proc/asound/card0/codec#0 > pluggedin.txt



# When not plugged in:

cat /proc/asound/card0/codec#0 > notplugged.txt



# Then compare the differences

diff pluggedin.txt notplugged.txt

For me the difference was in 'Node 0x16' under 'Amp-Out vals':

Node 0x16 [Pin Complex] wcaps 0x40058d: Stereo Amp-Out             Node 0x16 [PinComplex] wcaps 0x40058d: Stereo Amp-Out

  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1         Amp-Out caps:ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1

  Amp-Out vals:  [0x80 0x80]                                    |    Amp-Out vals:  [0x00 0x00]

So I based the detection on the difference found.

Howto mute

With this knowledge you can have a script running in the background. If unplugged the scripts mutes your speakers like using amixer sset Master playback 0% (or any other command).

#!/bin/bash

# This scripts detecs unplugging headphones.



oldstatus="unrelated string"

while [ 1 ]; do

    # The following line has to be changed depending on the difference (use diff) in '/proc/asound/card0/code#0'

    status=$(grep -A 4 'Node 0x16' '/proc/asound/card0/codec#0' |  grep 'Amp-Out vals:  [0x80 0x80]')

    if [ "$status" != "$oldstatus" ]; then

        if [ -n "$status" ]; then

            echo "Plugged in"

             amixer sset Master playback 80% # Set volume to 80%

            oldstatus="$status"

        else

            echo "Unplugged"

            amixer sset Master playback 0%  # Mute

            oldstatus="$status"

        fi

    fi

done

You can make it executable with chmod +x scriptname.sh and put it in the startup applications. You will have to adjust the unplug detection though by finding your own difference in /proc/asound/card0/codec#0 (maybe even change the numbers here for multiple soundcards.