I refer to this ticket http://www.pulseaudio.org/ticket/665 As lennart said I tried to load module loopback with the command pactl load-module module-loopback it answers to me with 22 that I suppose is the number of devices found. After that I found that from the speakers I could hear the sound from the mic integrated in my webcam, so the command had some effect. I muted the mic from Pulseaudio settings. I tried to listen my tv card audio, but no way. Tvtime was unable to connect to pulseaudio. i.e. launching tvtime like this tvtime --mixer=pcm:0 the answer was: mixer: Can't open device pcm, mixer volume and mute unavailable. mixer: No such mixer channel '0', using channel 'line'. I tried different devices, but the answer was always the same. After that I made a call with skype and on the other side the person could listen to my tv card audio instead of my voice coming from the mic. I tried different settings using Pavucontrol, but finally I rebooted the system and everything was back to the normality. Any suggestion?