If a make a sound test (with headphones pluged in) whith Quadraphonic selection i can hear FL in my left headphone ,FR in my right headphone,RL in left internal speaker and RR in right internal speaker.
I don't have any sound on laptop's internal speakers but i can hear in headphones.In PLAYBACK DEVICES headphones are detected as speakers and when i unplug them sound automatically turns to SPDIF- no sound on internal speakers. I have a wired problem with realtek hd r237 windows 7 drivers:
Realtek Hd Problem, Headphones Work As Speakers Dec 7, 2009