no audio output on laptop audio jack

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http://forums.fedoraforum.org – helo people I have Asus K55V, fedora 17 64 biti instaled. I have audio from laptop, but I canot use an audio sistem because when I connect the audio jack in audio out port, it doesn't get out any sound anymore. The sound from laptop stops and audio sistem doesn't work either. In win 7 it works OK. The sound hard from my laptop is provided by realteck. (HowTos)