@IsraelDahl
This hw-detect bug can be overcome by just removing the blacklist file

sudo rm /etc/modprobe.d/blacklist.local.conf

Reboot.

Some users will also have to add snd-aoa-i2sbus to /etc/modules (this is
like modprobing the module on startup) AND also remove the snd-powermac
line.

If you still have no sound (or more precisely alsamixer doesn't load)
then it is likely you are suffering from bug 1066435 . The only way to
overcome this is to patch and re-compile the snd-aoa modules.

To get your device-id:

On a working install (e.g. 12.04) open alsamixer (type alsamixer from a
terminal), hit F2, select /proc/asound/cards. Mine is listed as

PowerMac Snapper (Dev 38) Sub-frame 0

38 is the device id.

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https://bugs.launchpad.net/bugs/1296373

Title:
  [PATCH] Fix sound on PowerPC

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