It looks like it was a patch, but I'm not quite sure what to do. If anyone has suggestions, ideas, or needs the output of anything, please let me know. Thanks in advance for any help.
I added the following lines to the end of /etc/modprobe.d/alsa-base.conf and then did sudo reboot:
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alias snd-card-0 snd-hda-intel
alias sound-slot-0 snd-hda-intel
options snd-hda-intel model=hp-dv4-1222nr
I've seen a lot of different model options for this before, but I guess this one was a patch for kernel version 2.6.31, so if you have this version or higher, these lines should fix the problem. Sometimes it takes just a little more poking around to find the answer.