All right, I'm out of ideas. In my wife's sid machine, she has a Hauppague BT878-class TV capture card connected to a cable box. She uses tvtime to watch television when she is on the computer. About a week ago, she suddenly had no audio from the card. She turned off one evening before going to bed, and the next morning, she turned it on, and had no audio. I have looked at in kmix, alsamixer, the kde sound settings, and, I think, even the pavucontrol app (it was one of the pulseaudio apps, can't remember which one -- pulse audio and I have had a contentious relationship at best). Nothing. No changes were made between when she turned tvtime off and when she turned it back on the next morning. I also tried using vlc to connect to the capture card, and still no audio.
Can anyone suggest where the problem might lie?