This is an “Asked & Answered” post - I can’t believe I was the only one who had this issue.
After an upgrade, I had no sound output whatsoever. I dualboot, so testing the other OS revealed there was nothing wrong with the speakers or connections.
It took me a while, but basically I downgraded “libpulse” & “pulseaudio” from 6.0.1 to their previous versions, 5.0.1 - & now sound is restored;
cd /var/cache/pacman/pkg sudo pacman -U pulseaudio-5.0-1-x86_64.pkg.tar.xz libpulse-5.0-1-x86_64.pkg.tar.xz
Then prevent pacman from upgrading these packages;
cd /etc && sudo nano pacman.conf
Uncomment IgnorePkg from /etc/pacman.conf and add them in sequence
IgnorePkg = libpulse pulseaudio
That 's it! This solution brought to you on the back of much sweat, tears & frustration on my part.
It is the first significant problem I’ve had after over a year running Antergos, other than a “libxcursor” issue many moons ago. Super happy with this distro - thanx for your hard work!