If anyone needs to get the 3.5mm audio jack working on the N2+, here's one method.
1. Edit or create /etc/asound.conf with these lines. Copied directly from the Hard Kernel Ubuntu setup.
pcm.!default{
type hw
card 0
device 1
}
ctl.!default{
type hw
card 0
}
2. Run this script to turn on the 3.5mm audio in alsamixer. The settings are listed in the same order as in alsamixer.
#!/bin/bash
# 3.5MM JACK, set to max gain
amixer sset 'ACODEC' '255'
# 3.5MM JACK - set in/out channels (src/sink)
amixer sset 'FRDDR_B SINK 1 SEL' 'OUT 2' || true
amixer sset 'FRDDR_B SRC 1 EN' 'on' || true
# 3.5MM JACK
amixer sset 'TOACODEC SRC' 'I2S C' || true
amixer sset 'TOACODEC OUT EN' 'on' || true
amixer sset 'TOACODEC Lane Select' '0' || true
# SAVE NEW SETTINGS
alsactl store
Groove On got a reaction from lanefu in Odroid N2+, 3.5mm analog audio, alsamixer settings