I have an external USB sound card on a Fedora 17 system (64 bit). It stopped playing sound after I updated the kernel to 3.5.4-1 (the problem persists under 3.5.4-2).
As the sound card still plays sound when I boot 3.5.3-1, I assume that the problem is neither hardware-related nor a matter of badly configured settings. I still checked the usual suspects for bad settings (Phonon, alsamixer, pavucontrol), but everything looks OK there as far as I can tell.
I assumed that this is a kernel bug, and even submitted it. But now a friend sent me a link to a Google Plus post which seems to say that a similar (the same?) problem is not a kernel bug, but comes from a kernel module not being loaded.
it looks like the new alsa-utils or whatever now require SND_SEQUENCER
lsmod does not list SND_SEQUENCER on my system.
I don't know Linux well. In my understanding, if the problem is in alsa-utils, but only occurs with the new kernel, it means that either the new kernel is not loading a module the old one did load, or that booting with the new kernel also starts an old version of alsa-utils. Both explanation sound improbable to me, but I could be wrong.
My actual questions:
- Could this really be a matter of the module not loading, despite the fact that alsa still works with the old kernel?
- How do I get my system to load the module? (Do I have to install it first, and where does it come from?)
- If this doesn't work, do you have other suggestions for trying to resove the problem (or at least determining for sure that it is indeed a kernel bug and so not resolvable with my limited knowledge)? I don't know where to start.