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.
HGST Ultrastar HE10 HUH721010ALE600 10TB SATA 6Gb/s 7200RPM 3.5" Enterprise HDD
$69.99
Western Digital WD60PURZ 6TB Hard Drive SATA6 Gb/s 64MB Cache 3.5 Inch
$109.99
WF12F DELL 1TB 7.2K 6GBPS SATA 2.5'' HDD HARD DRIVE ST91000640NS 0WF12F
$25.00
WD 2TB Certified Refurbished Elements, External Hard Drive - RWDBU6Y0020BBK-WESN
$49.99
HGST Ultrastar DC HC520 12TB SATA 6Gb 256MB 3.5" Enterprise HDD- HUH721212ALE601
$82.99
Seagate Exos 7E10 ST2000NM000B 2TB 7200RPM SATA 6.0Gb/s 3.5" Internal Hard Drive
$29.99
2 PACK Seagate ST1000LM035 Mobile HDD 1TB 2.5" SATA III Laptop Hard Drive
$26.85
Western Digital WD5000LPLX 500GB 2.5" SATA 32MB 6Gb/s 7200RPM Laptop Hard Drive
$7.99
WD 16TB Elements Desktop, Certified Refurbished Hard Drive - RWDBWLG0160HBK-NESN
$174.99
WD 4TB Certified Refurbished Elements, External Hard Drive - RWDBU6Y0040BBK-WESN
$69.99