[sugar etiona] Audio headphone volume slider is mute
The ALSA "Headphone" control is muted, so no sound comes out of external speakers. "alsactl init" fixes this but also halves the main audio volume, while "amixer set Headphone unmute" makes it work. That leaves the Headphone volume at 0 but some sound still comes out of the headphone socket, if quietly, so "unmute 100%" may be better.
Note that if pulseaudio is running, it takes over mixer#0 and it can be fun trying to find out what the proper mixer device is called, so "alsactl init" may be a simpler solution.