No sound from notebook speakers while I can hear the sound in headphones

Question

I can hear no sound in the speakers. When I attach headphones the sound is heard correctly. alsmixer shows no clues:

(when I attach headphones speaker gets muted and sound-bar of headphones goes up to 100 - visible in real-time)

Again pavucontrol - Ubuntu volume control - seems OK:

(when I attach headphones port changes to "Headphones (plugged in)" - visible in real-time and I hear the sound via headphones as expected)

There is one thing interesting in gnome-alsamixer though. However I have no idea how to rectify it. When launched from terminal it prints the following errors:

    pdebski@PaDeLT430s:~$ gnome-alsamixer

    ** (gnome-alsamixer:24782): WARNING **: gam_toggle_get_state (). No idea what to do for mixer element "Auto-Mute Mode"!

    ** (gnome-alsamixer:24782): WARNING **:         gam_toggle_get_state (). No idea what to do for mixer element "Loopback Mixing"!

    (gnome-alsamixer:24782): GLib-CRITICAL **: Source ID 71 was not found when attempting to remove it

and shows speaker muted:

However un-muting speaker and sliding it to top does not help. Same for "Internal". Note that when I close and reopen gnome-alsamixer both Speaker and Internal sliders stay at the top position but no sound from internal speakers is heard.

What else can I do to hear the sound in the speakers?

please take a look at below link, I hope it help you. enter link description here — Ali Akbarpour, Jun 17 '17 at 14:11
@Generic - Could you please be more specific what exactly shall I try? The post https://askubuntu.com/questions/150887/sound-from-both-headphones-and-speakers include a number of various threads and answers. Which one exactly do you mean? — Pawel Debski, Jun 17 '17 at 15:13

No sound from notebook speakers while I can hear the sound in headphones

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