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.
Dell Optiplex 5060 SFF 8th Gen Core i7 3.2GHZ 16GB 512GB Win 11 Pro
$249.00
Lenovo IdeaCentre 3 07IRB8 Desktop Intel Core i5-13400 16GB 512GB SSD W11H
$429.99
Intel - Core i9-13900K 13th Gen 24 cores 8 P-cores + 16 E-cores 36M Cache, 3 ...
$689.99
Intel - Core i7-13700K 13th Gen 16 cores 8 P-cores + 8 E-cores 30M Cache, 3.4...
$489.99
Dell OptiPlex 7060 Micro 8-Core i7 8700 3.20GHz 16GB 512GB SSD Win 11 Pro
$214.00
AMD Ryzen 7 7800X3D 8-Core - 16-Thread 4.2 GHz (5.0 GHz Max Boost) Socket A...
$339.95
Apple Mac Pro Processor Tray 5,1 2010 2012 2.4ghz 8 core
$79.99
Dell 9020 Optiplex Micro-Intel Core i5 - 1TB SSD 8GB RAM Window 11
$129.49
Dell optiplex 7050 Intel core I7-7700 3.6 GHz 8 GB ram No HDD/No OS
$89.99