[Pkg-xfce-devel] Bug#711460: xfce4-mixer: changing sound volume not working after muting

[joaopirralha at gmail.com (João Pirralha)]

I also had this problem on a freshly installed Debian Testing, I had to 
run the following commands as a workaround (I got them from the ArchWiki):

xfconf-query -c xfce4-keyboard-shortcuts -p 
/commands/custom/XF86AudioRaiseVolume -n -t string -s "amixer set Master 
5%+ unmute"
xfconf-query -c xfce4-keyboard-shortcuts -p 
/commands/custom/XF86AudioLowerVolume -n -t string -s "amixer set Master 
5%- unmute"
xfconf-query -c xfce4-keyboard-shortcuts -p 
/commands/custom/XF86AudioMute -n -t string -s "amixer set Master toggle"