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.
Cisco SG95-16 16-Port Gigabit Switch SG95-16-KR
$47.00
Cisco Meraki MS120-48LP 48 Port Blade Ethernet Switch UNCLAIMED
$799.00
Cisco (SG100D-05-UK) 5-Ports External Ethernet Switch
$40.00
8 Ports Unmanaged Industrial Ethernet Switch Network Gigabit Ethernet Switch
$76.50
HP 2530-48G 48 Port Gigabit Ethernet Network Switch J9775A
$30.95
Linksys SE3008 8 Ports Rack Mountable Gigabit Ethernet Switch
$21.99
New Linksys SE3005 5-port Gigabit Ethernet Switch
$18.99
HP ProCurve 2530-24G J9776A 24 Port Gigabit Ethernet Managed Network Switch
$34.99
Juniper Networks EX3300-48P 48-Port PoE+ 4x SFP+ Network Switch w/ Power Cord
$43.95
Netgear Prosafe Plus JGS524PE 24 Port Gigabit Switch 12 Port PoE JGS524PE-100NAS
$129.98