Ah the mysteries of Sound output to laptop speakers (lack of) in Zorin Core have bitten me once again. As usual, this follows a linux kernel update via software updater. I always do a Settings>Sound>Speaker Test after the update boots and recently have been surprised that I can hear “front left” and “front right” being recited. That was the case yesterday, hence happy bunny.
But that was yesterday.
I did a cold boot into Zorin today, heard click (expected) then background hiss (unexpected) through the speakers whilst Zorin banner was displyed. Thinking something was amiss I did a Speaker Test. Silence.
Normally this anomoly can be fixed quickly by me sliding the volume control (part of Sound settings) back and forth frantically from 0 to 100% a few times. Nope, not today.
Then checked sliders on Alsamixer (terminal) for any Muted items. Nope.
Then booted the previous kernel, Speaker Test and volume control exercises then repeated. Nope.
Now to check the hardware. Booted Windows, Sound from speakers OK.
Booted Zorin again, Speaker Test and volume control exercises again. Yay!, get “front left” and “front right” again. Music to my ears.
I have since installed PulseAudio Volume Control as recommended by @AZorin here.
I uninstalled GNOME ALSA mixer at same time, as could not see the point as Alsamixer is available in terminal.
I am not expecting any help here as Sound issues like this have been discussed before and my conclusion is that under Linux/Ubuntu/Zorin Sound is an art (involves luck) and not a science.
Go on, disprove my hypothesis.