How to sound out with LINEOUT_R and LINEOUT_L?

[kimwida]

1. Install fresh debian. (Linux 4.4.143-55-rockchip)
2. Update debian
   #apt update, #apt upgrade
3. Install alsa-utils
   #apt install alsa-utils
4. Add /etc/asound.conf

pcm.!default {
type hw
card 1
}

ctl.!default {
type hw
card 1
}

Audio Support Rock Pi S

with a very basic /etc/asound.conf pcm.!default { type hw card 1 } ctl.!default { type hw card 1 } I was able to get some sound out of my Rock Pi S. I connected headphones to GND, PIN 25 and PIN 26… BUT: I only got sound on one ear. I switched PIN 25 and 26 and got sound on the other ear so it not broken headphones.

5. Connect LINEOUT_R and GND to small speaker
6. Install mplayer
   #apt install mplayer
7. Play a sound
   #mplayer 1.mp3
8. It is working.

I don’t know why it can’t make sound with pulseaudio but alsa.