tks for the infos.

Thanks now is working, despite watching video on internet (and internet in general) is extremely slow and not synchronized with the audio.
I got 2pi some weeks ago, followed all the instructions as per infos on the web site, therefore I do have a raspbian OS.

No way to sort it out. I will contact the factory because i guess it could be a failed piece...is could not be so "unfriendly use"

yes I do. But I have tried also with simply headphone with the same negative result. I am also a beginner in the linux environment but I will try to follow the info on your link and see if I will able to sort it out something...

I plugged both headphone and speakers (via usb plug) but do not work at all.

hi, i just get into the configuration of a raspberry 2pi, so I am a very beginner. get all the update and upgrade but the audio do not work. any suggestion? tks in advance.