Xfce volume bar issue - Does not get out of mute

[Rajesh Khan]

After installing Xfce on my fedora 20 machine. I could not find a volume
bar in my panel so I did the following

sudo yum install xfce4-mixer

I then added the following

Pannel >> Add New Items >> Audio Mixer

The Audio Mixer appeared and seems to be working fine. However there is one
problem. If I drag the volume bar all the way down the sound goes on mute.
Dragging it all the way up then does not unmute the sound. Any suggestions
on how I can fix this problem ?
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