pcDuino3 defaults to output its audio from the audio jack. In cases, users would like to output the audio from the HDMI port. In this post, we will explain the steps taken to change the default audio output to HDMI port.

First, we need to check the available sound card on pcDuino. Open a terminal, and type:

$alsamixer

Now press ‘F6’ to list all the available sound cards:

Here we find that there are two sound cards, one is the audio jack, and the other is HDMI. To change the default audio device, we just need to do the following:

$vi /etc/asound.conf


defaults.ctl.card 1
defaults.pcm.card 1
defaults.timer.card 1

‘1’ means the number of the sound card. Per the results of alsamixer, we can tell that the default output device will be HDMI after the modification.