sound device initialization?

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Lately when I install updates and reboot, I'll randomly
have no sound when I log back in. I'm supposed to get
sound output on my HDMI interface (being run by the
nvidia binary driver from rpmfusion).

If I run "gnome-control-center sound", it will show
as currently using a dummy device, and if I try to switch
to HDMI output (which is listed as a choice), it won't
allow me to test the audio out.

Rebooting and hoping I'll have sound when I come back
has been the only way I've found to fix this so far.

Anyone know if there is some way to re-initialize
audio devices less drastic than rebooting?
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