Comment 0 for bug 22876

C. Cooke (ccooke) wrote :

The keyboard shortcuts control (gnome-keybinding-properties) has keys for volume
up, volume down and mute. It is these keys which hardware buttons on laptops and
multimedia keyboards are assigned. However, there is no way to control which
mixer device the keys control. On my laptop, they control the PCM-2 mixer, which
has absolutely no effect on the output volume.