I assume the sound output of your tv card goes through line in. Try KMix to deselect line in.
I love the new Knoppix DVD but have a problem I haven't encountered with any other distro of Linux - previous Knoppix included:
I have an old ATI TV Card in my computer and when my machine boots with Knoppix, it "senses" the card and immediate begins playing TV sound. If I try to load the TV software xawtv, the software works flawlessly - as good as the MS software that was made for the card. However, if I close the program, the sound stays on until I turn off the machine.
Of course I could mute it, but finding out how to fix the problem is so much more fun.
I assume the sound output of your tv card goes through line in. Try KMix to deselect line in.
Atari 1020 Color Printer No Cables, Power Supply , Or Manual
$54.99
Atari 800xl 65xe 130xe XEGS Pico. A8PicoCart. Loaded with ROMs Red/White
$28.00
Atari Power Cube 800XL, 600XL, 65XE, 130XE USB-C Power Supply PSU
$11.25
Atari 800xl 65xe 130xe XEGS Pico. A8PicoCart. Loaded with ROMs Gray/Gray
$25.00
Rana Systems 1000 Atari Compatible Floppy Disk Drive System w/cables. Powers On
$139.99
Atari 600XL computer with power supply (untested)
$125.00
A8PicoCart Atari 8bit A8 Pico Cart multi cart For Atari Computers 800/XL/XE/XEGS
$28.95
Vintage Original Atari 800XL Home Personal Computer Console / Keyboard UNTESTED
$99.99
Atari 800 8-Bit Home Computer Complete in Box Bueatiful Condition Powers up
$399.00
A8PicoCart Kit Atari 130 65 XE 800 600 XL unocart clone multicart cartridge game
$19.95