Getting Headphones to Work in Debian on an iMac

After desperately searching for a solution to the Debian install on my old 2012 iMac not producing sounds through the headphone jack connected speakers, this provided the solution:

To fix this problem, you have to load snd-hda-intel module with model=imac27_122 option.

To do this, create a new file in /etc/modprobe.d (for example /etc/modprobe.d/sound.conf) with following content:

options snd-hda-intel model=imac27_122 

Reboot and headphones will work as expected.

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