After my laptop suspends, it often (though as far as I can tell not quite 100% of the time?) does not get sound back. gnome-volume-control errors out with: "No volume control GStreamer plugins and/or devices found." rhythmbox says: "Couldn't stop playback Unknown playback error" etc. I don't need to reboot to fix it, just log out and log back in. Still, very irritating. lshal attached in case this is somehow hardware-specific. [Some other bugs suggest that this might be the case, but I can't find any with my specific hardware.] [Filed against the kernel because I have no idea who else is responsible for suspend behavior.]
Created attachment 254671 [details] lshal in case it is HW-specific.
I have the same problem after hibernating (haven't try suspend). When my laptop wake up after hibernation, audio is broken in my running session. As Luis said "just log out and log back in" fixes the problem. I suspect PulseAudio to be the culprit (or something related to it). Indeed, I see in my session profile there is a startup entry called "PulseAudio Session Management" which load module-x11-xsmp into PulseAudio when it log back in.
It looks to me like a permissions problem. See: https://bugzilla.redhat.com/show_bug.cgi?id=384271
That is in fact the problem; marking as dup since that one has the correct diagnosis. *** This bug has been marked as a duplicate of 384271 ***