I need to enable sound on root user mode, I am on Ubuntu 12.04 when I login as root I can see the volume control is disabled, I searched and found that pulse audio wont work on root user mode, but I also found that System-Wide Daemon, so just applied this for root as shown below.
addgroup --system pulse
adduser --system --ingroup pulse --home /var/run/pulse pulse
addgroup --system pulse-access
# Some distributions restrict access to the sound devices to a group audio
adduser pulse audio
# Add a user to the pulse-access group
adduser root pulse-access
But while reboot still the volume control is disabled. What could be the issue, how can enable sound on root mode.
Basically what I want to do is using libao play some audio in root usermode, but when running the program I am getting the error like
ALSA lib pcm_dmix.c:1018:(snd_pcm_dmix_open) unable to open slave