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?
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.
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="$status" fi fi done
You can make it executable with
chmod +x scriptname.sh and put it in the startup applications. You will have to adjust the unplug detection though by finding your own difference in
/proc/asound/card0/codec#0 (maybe even change the numbers here for multiple soundcards.
This worked for me on Ubuntu 14.04:
"with the headphones out mute it. Insert headphones and raise volume. Remove headphones and check for mute."
Credit: RevDrStrangelove on https://www.reddit.com/r/LifeProTips/comments/369k76/lpt_request_automaticly_mute_laptop_after_headset/
For ubuntu-16.10 I made few change in this answer.
oldresult="Some Random String" while [ 1 ]; do # incase of plugged out result will contain some data result=$(grep "EAPD 0x2: EAPD" /proc/asound/card0/codec#0) # checking for oldresult if not same then only go inside if [ "$oldresult" != "$result" ]; then oldresult=$result if [[ -z "$result" ]]; then notify-send "Plugged In" amixer sset Master playback 80% # Set volume to 80% else notify-send "Plugged Out" amixer sset Master playback 0% # Set volume to 0% fi fi done
If you have problems with events catching in
/etc/acpi/handler.sh see my answer. It's also without device codes as