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?