Hello.
First I have follow the recommendations from https://forums.opensuse.org/english/get-technical-help-here/install-boot-login/490829-no-sound-hdmi-opensuse-12-3-a.html
It seems that I have to modify my sound config each time I want to view a film on my tv via the HDMI connection between the tv set and my laptop ( to get sound on the tv ).
I have to change the config to digital (hdmi ) option. The normal setup is Analog stereo.
Is ther a way to make the choice more simple.
Here alsa config :
http://www.alsa-project.org/db/?f=c75f81efab490bd4e510220045951f6c522fd434
Any help is welcome.