Sound does not work on BeagleBoard (rev C5) with Ubuntu 14.04.3

Hi all,

Unfortunately I cannot get the sound to work on my BeagleBoard (rev C5) with Ubuntu 14.04.3. I try to use the internal stereo out jack.

Playing any file fails with the following error:

abarth@arm:~$ aplay /usr/share/sounds/alsa/Front_Left.wav
ALSA lib confmisc.c:768:(parse_card) cannot find card ‘0’
ALSA lib conf.c:4248:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory
ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings
ALSA lib conf.c:4248:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory
ALSA lib confmisc.c:1251:(snd_func_refer) error evaluating name
ALSA lib conf.c:4248:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:4727:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM default
aplay: main:722: audio open error: No such file or directory

The sound card does not seem to be recognized:
abarth@arm:~$ aplay -l
aplay: device_list:268: no soundcards found…

However, in /proc/asound, I see a card0:

abarth@arm:~$ ls /proc/asound
card0 cards devices modules omap3beagle oss pcm seq timers version

Sound kernel modules seem to be loaded:

abarth@arm:~$ lsmod | grep snd
snd_soc_twl4030 42147 1
snd_soc_omap_mcbsp 25505 2
snd_soc_omap 3125 1 snd_soc_omap_mcbsp
snd_soc_omap_twl4030 7256 0
snd_seq_midi 6165 0
snd_seq_midi_event 7274 1 snd_seq_midi
snd_soc_core 191982 4 snd_soc_omap_twl4030,snd_soc_omap,snd_soc_omap_mcbsp,snd_soc_twl4030
snd_compress 13928 1 snd_soc_core
snd_pcm_dmaengine 5682 2 snd_soc_core,snd_soc_omap
snd_pcm_oss 41006 0
snd_rawmidi 24220 1 snd_seq_midi
snd_mixer_oss 15253 1 snd_pcm_oss
snd_pcm 97788 6 snd_pcm_oss,snd_soc_core,snd_soc_omap,snd_soc_omap_mcbsp,snd_pcm_dmaengine,snd_soc_twl4030
snd_seq 67850 2 snd_seq_midi_event,snd_seq_midi
snd_seq_device 5368 3 snd_seq,snd_rawmidi,snd_seq_midi
snd_timer 22978 2 snd_pcm,snd_seq
snd 72286 9 snd_pcm_oss,snd_soc_core,snd_timer,snd_pcm,snd_seq,snd_rawmidi,snd_seq_device,snd_compress,snd_mixer_oss
soundcore 8445 1 snd

I have the following alsa packages installed:

abarth@arm:~$ dpkg -l | grep alsa
ii alsa-base 1.0.25+dfsg-0ubuntu4 all ALSA driver configuration files
ii alsa-utils armhf Utilities for configuring and using ALSA

Some more info on my system:

abarth@arm:~$ uname -a
Linux arm 4.1.5-armv7-x2 #1 SMP Tue Aug 11 21:04:06 UTC 2015 armv7l armv7l armv7l GNU/Linux
abarth@arm:~$ cat /etc/issue
Ubuntu 14.04.3 LTS \n \l console Ubuntu Image 2015-08-17

Any help or directions would be greatly appreciated!


sudo usermod -a -G $USER audio

Thank you very much, Joshua, this solved indeed my problem!