Linux - no sound after upgrade

The old 2 headed display

On Fedora 25;

Few days ago I upgraded my kernel, easy process, but my second monitor stopped working.  I didn't care much and wasn't going to spend any time fixing it since I was going to order a single larger monitor anyway, so I went back to the older kernel.  When I hooked up the new monitor and booted the new kernel I noticed sound wasn't working.  Long Google hunt later, with no correct answers found, I noticed for the fully working kernel I had a second packaged called  "kernel-modules-extra".

Sure enough, installing "kernel-modules-extra" with a version number which matched the new kernel fixed the sound problem, and likely would have fixed the the second monitor problem too.

You can test for this problem using "aplay -a", if you get a "no sound cards found" message then likely you have a kernel/driver issue which may be solved by installing the correct version of the "kernel-modules-extra" package.

locnar<132>% rpm -qa | grep -i kernel

kernel-headers-4.9.6-200.fc25.x86_64
kernel-core-4.13.16-100.fc25.x86_64
kernel-core-4.9.6-200.fc25.x86_64
kernel-core-4.1.13-100.fc21.x86_64
kernel-modules-4.13.16-100.fc25.x86_64
kernel-modules-extra-4.9.6-200.fc25.x86_64
kernel-4.1.13-100.fc21.x86_64
kernel-modules-extra-4.13.16-100.fc25.x86_64
kernel-4.9.6-200.fc25.x86_64
abrt-addon-kerneloops-2.9.0-1.fc25.x86_64
kernel-modules-extra-4.1.13-100.fc21.x86_64
kernel-modules-4.1.13-100.fc21.x86_64
kernel-debug-devel-4.9.6-200.fc25.x86_64
kernel-modules-4.9.6-200.fc25.x86_64
libreport-plugin-kerneloops-2.8.0-1.fc25.x86_64

The new 4k curved display