No sound after updating the kernel 3.11 to 3.12
In fedora 19 that happened after updating Kernel 3.11 to 3:12 through yum. I was mute.
Exprimentei with fedora 20, I formated the whole disk, did a clean install, and when updating the kernel 3.11 to 3.12 in fedora 20. I was again without sound on the sound card.
If I use phones works but not speaaker,
My sound card is HDA intel.
My Alsa Info: http://www.alsa-project.org/db/?f=e8556944338fc0ee0f052fb21d3c01fdcfb3616b
Check this answer here about alsamixer and pavucontrol. You will check the same thing, but for the speakers, not headphones. I think that pavucontrol will solve your problem.