Found the solution here:
https://forum.manjaro.org/t/sound-not-working-after-update-to-manjaro-21-1/73773/2
Quoting Goose:
I found a workaround on the Ubuntu forum. Scroll down to the bottom and someone responded with a solution for Arch. Basically, follow these steps:
Edit grub config
sudo nano /etc/default/grub
Add the following within the quotation after GRUB_CMDLINE_LINUX_DEFAULT
snd_intel_dspcfg.dsp_driver=1
Update grub
sudo update-grub
Reboot
This forces the legacy driver, or in my case, forces the laptop internal audio to be default, rather than the HDMI.
Here’s the link to the thread where I found that solution:
https://askubuntu.com/questions/1243369/sound-card-not-detected-ubuntu-20-04-sof-audio-pci