ALSA - sound not going to headphones

Hi, have searched for a solution to this issue but cannot figure out what is going on.
I have a laptop with built in intel hda audio.
for some reason sound will not play from through the headphones from usual sources.
alsamixer shows headphone volume control, and if i type
aplay -D plughw:0,2 /usr/share/sounds/alsa/Front_Right.wav
sound does come through the headphones and volume is controlled by alsamixer.
however plugging the headphones in does not make sound come through them, so youtube, clementine, vlc etc. all keep playing through the laptop speakers.
it is probably something very simple in config but alsa is a mystery to me.
any help would be very much appreciated,
thanks.
ad.

I have a similar setup to a sound bar not a bose.  Start by checkimng the optical audio cable is working (red light from it?) and that the bose and ATV ports are working.  Cable and port issue a good first thing to rule out.

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