Sound stopped working after upgrading to Linux 5.4 (Intel HD Audio)

Question

After upgrading from Linux 5.3 to Linux v5.4.2 on Arch Linux, all of my audio stopped working. The only thing I see in Gnome 3's Sound settings is "Dummy Output" and aplay --list-pcm says: "No card(s) found." and running aslactl init says: "alsactl: init:1759: No soundcards found."

I've tried many solutions already.

Answer 1

Here is how I was able to resolve this:

1. sudo vim /etc/default/grub
2. Find GRUB_CMDLINE_LINUX_DEFAULT and add snd_hda_intel.dmic_detect=0 to the end of it. (ex: GRUB_CMDLINE_LINUX_DEFAULT="loglevel=3 snd_hda_intel.dmic_detect=0")
3. sudo grub-mkconfig -o /boot/grub/grub.cfg
4. Reboot the system.

Answer 2

This seems to be caused by the config option SND_HDA_INTEL_DETECT_DMIC being enabled in the 5.4 kernel (https://bugs.archlinux.org/task/64720).

The suggested fix is to undo the change by passing snd_hda_intel.dmic_detect=0 as a kernel parameter, as explained in this answer.