I just remembered that my laptop also has volume-control keys on Fn-PageUp (XF86RaiseVolume), Fn-PageDn (XF86LowerVolume), and Fn-End (XF86AudioMute). Here too, the first two work but NOT the mute control.
I just remembered that my laptop also has volume-control keys on Fn-PageUp (XF86RaiseVolume), Fn-PageDn (XF86LowerVolume), and Fn-End (XF86AudioMute). Here too, the first two work but NOT the mute control.