I am using different distro, and having exactly the same problem with exactly same web cam which is Logitech c270. It was working fine with older version of pulseaudio it does not work without pulseaudio and next versions :
pulseaudio 10.0-2 pulseaudio-alsa 2-3 xfce4-pulseaudio-plugin 0.2.4-5 libpulse-10.0-2-x86_64.pkg.tar.xz
worked fine with : pulseaudio-9.0-1-x86_64.pkg.tar.xz libpulse-9.0-1-x86_64.pkg.tar.xz
I am using different distro, and having exactly the same problem with exactly same web cam which is Logitech c270. It was working fine with older version of pulseaudio it does not work without pulseaudio and next versions :
pulseaudio 10.0-2 o-plugin 0.2.4-5 10.0-2- x86_64. pkg.tar. xz
pulseaudio-alsa 2-3
xfce4-pulseaudi
libpulse-
worked fine with : 9.0-1-x86_ 64.pkg. tar.xz 9.0-1-x86_ 64.pkg. tar.xz
pulseaudio-
libpulse-