I installed F20 shortly after it's release. Everything worked as expected. All kernels released since then have resulted in the sound not working.
The kernel that works is 3.11.10-301.fc20.i686+PAE. Sound does not work for the 3.12.x and 3.13.x kernels.
I have searched for a solution for this and found several recommendations but none worked for me.
I have compared a listing of the modules (lsmod) from the working kernel and non-working kennel and both lists have the same sound modules loaded (there is a size difference in some of the modules, but I expected that).
I have compared the output from amixer for both working and non-working kernels and they are exactly the same.
The sound related packages that are installed are:
pulseaudio-libs-glib2-4.0-13.gitf81e3.fc20.i686 alsa-tools-firmware-1.0.27-3.fc20.i686 alsa-utils-1.0.27.2-4.fc20.i686 alsamixergui-0.9.0-0.16.rc2.fc20.i686 alsa-lib-1.0.27.2-2.fc20.i686 pulseaudio-libs-4.0-13.gitf81e3.fc20.i686 alsa-firmware-1.0.27-2.fc20.noarch
I am not very knowledgeable about sound. I am sure I need to check other configuration settings but I do not know which files are relevant.
Any help will be appreciated,
David