Workaround:
$ sudo apt-get install alsa-tools
$ sudo hda-verb /dev/snd/hwC1D0 0x1 set_gpio_data 1

Upstream seems to be working on the issue:
http://mailman.alsa-project.org/pipermail/alsa-devel/2013-September/066167.html

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https://bugs.launchpad.net/bugs/1247475

Title:
  Macbook Pro 15 Haswell/Retina 11.1 Speakers Do Not Work (Ubuntu 13.10)

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