Comment 2 for bug 112425

You can find the requested information at:
http://pastebin.ca/490172

I used the line out jack at the front of my computer for a while so I had stereo sound. In this case my receiver is connected with the front line out jack.
I just changed the situation back and connected the receiver to the line out jack at the back side of the computer and got my stereo-sound back! So its (temporary) solved.
I still believe there is a bug. The next days I will listen to my headphones again and see what happends.

Thanks so far.