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This might work for you or fail to. Doesn't hurt to try.
I got this info at Pulseaudio original post and just refined it.
Open /usr/share/pulseaudio/alsa-mixer/paths/analog-output.conf
Locate the following sections:
[Element Speaker]
switch = mute
volume = off
[Element Desktop Speaker]
switch = mute
volume = off
Change the "volume" value so that it reads:
[Element Speaker]
switch = mute
volume = merge
[Element Desktop Speaker]
switch = mute
volume = merge
I have noticed after installing rythmbox this issue has returned. I shall find a fix for it soon. Also music on rhythmbox is awesome. Gnome music looks good but it doesn't work. Ever. I shall update with a fix for rhythmbox.