This will probably work with other distro’s/Baytrail Chromebook models.
- Get to a terminal.
- Type “alsamixer”.
- Press the brightness down key AKA F6.
- Find “Left Speaker Mixer Left DAC” and press “m” to unmute.
- Find “Right Speaker Mixer Right DAC” and press “m” to unmute.
- Update your distro to hopefully as new a kernel as possible (mine went to 4.1.4-200). This ensures that the sound card has the latest available firmware.
- Enjoy shiny (and possibly slightly dodgy) sound.