I am having strange issues with sound and volume with Ubuntu 11.10

I've noticed very often, especially when I get my computer out of sleep, it lacks sound even though the volume slider is cranked all the way up.

But when I plug my headphones in and then take them out, it seems to kick start my sound back!

What gives?

What daemon in /etc/int.d needs to be restared with the restart command to fix this?

I have the following in my init.d folder

/etc/init.d/alsa-restore and /etc/init.d/alsa-store

Also, my start up ubuntu sound doesn't play either....