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Hi, I know that you have gnome but from https://userbase.kde.org/Sound_Problems#Can.27t_mute_event_.28system.29_sounds_and_other_KMix_strange_problems

I recommend

rm -rf .pulse/
rm -rf .pulse-cookie 
rm -rf .config/pulse/

restart pulseaudio with:

killall pulseaudio

and run

/usr/bin/pavucontrol

on output devices try change port , it worked for me !

Hi, I know that you have gnome but from https://userbase.kde.org/Sound_Problems#Can.27t_mute_event_.28system.29_sounds_and_other_KMix_strange_problems

I recommend

rm -rf .pulse/
rm -rf .pulse-cookie 
rm -rf .config/pulse/

restart pulseaudio with:

killall pulseaudio

and run

/usr/bin/pavucontrol

on output devices try change port , it worked for me !

UPDATE : Now it is pretty clear to me how I can put headphones working :

I go to program: pavucontrol , go to tab : output devices and change port to Speakers (unavailable) and works all the time .