Arch sound on imac (2011 21.5")
Having installed Arch on an imac everything seems to work except sound through the headphones. Despite the speakers working and being able to switch speakers to headphones the sound just stops.
This is a fairly simple fix, once you know what to put where.
The file is
and all you have to add to it is
options snd-hda-intel model=imac27_122
Save the file and reboot, sound will now work as expected.