Bug#672173: Volume setting is missing an independent mute checkmark/button

[althaser]

found 672173 3.8.4-5+b1
kthxbye

Hey Martin,

It's missing mute button also with 3.8.4-5+b1.

Although using the following extension
https://extensions.gnome.org/extension/212/advanced-volume-mixer allows the
mute button.

cheers,
althaser