I must not have explained well enough. I am not trying to use headphones and
internal speakers at the same time. I am trying to input audio from an
external
receiver to the the line input of the internal sound card, then listen
to the amplified
audio. I can see the audio on the input but get no audio out the
speakers., this on
both systems both running Ubuntu 10.04. The note about plugging in the
headphone
is to say that for some reason Ubuntu does not recognise the activation
of the plug
either input on the line in or line out.
Now I would like to report the problem to the Ubuntu developers and
can't find out
how, and I am a member the forum but it isn't obvious as to how to do that.