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Sound: BeagleBoard C4

December 31, 2010

Here are my notes from the experimental process of learning how to get sound out of a Linaro image (Headless, ALIP, Netbook) and a BeagleBoard.

  • Plug amplified speakers into the 1/8″ jack closest to the s-video port – they must be amplified, signal is line level only
  • ALSA – Playback hardware devices:
    • card0: omap3beagle
    • device0: TWL4030
    • No regular simple controls like “Master” defined for BeagleBoard
  • Sounds installed in /usr/share/sounds
  • Test with aplay
  • By default, all sound outputs for ALSA are set to 0 and/or muted
  • Configure with alsamixer
    • Unmute HeadsetL and HeadsetR, turn volume up for “DAC2 Analog” ~50 and “DAC2 Digital Fine” ~50-75, and “Headset” to ~ 67 for best results, these are the only controls that change line-level output via the onboard jack
    • All controls listed must be turned up or no level is present at the jack
  • Pulseaudio – Successful playback of .wav with paplay, one dropout, quality fairly good
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