TV Tuner Not Working - scantv Finds No Channels

[Scarletdown <gsutton9503@wavecable.com>]

Here is another problem that had been resolved at one time, but it has 
been so long, I don't remember how it was achieved.

I am trying to get my TV Tuner card working with either xawtv or 
TVTime.  The card is a bt878 type, and connected to the TV cable 
(us-cable, NTSC).  However, neither scantv nor TVTime detect any 
channels.  Here is what I get when I run scantv...

scarletdown@SunBlossom:~$ scantv

please select your TV norm
  0: PAL
  1: NTSC
  2: SECAM
  3: PAL-Nc
  4: PAL-M
  5: PAL-N
  6: NTSC-JP
  7: PAL-60
nr ? 1

please select a frequency table
  0: us-bcast
  1: us-cable
  2: us-cable-hrc
  3: japan-bcast
  4: japan-cable
  5: europe-west
  6: europe-east
  7: italy
  8: newzealand
  9: australia
 10: ireland
 11: france
 12: china-bcast
 13: southafrica
 14: argentina
 15: australia-optus
 16: russia
nr ? 1
[global]
freqtab = us-cable

[defaults]
input = Television
norm = NTSC


scanning channel list us-cable...
1    ( 73.25 MHz): no station
2    ( 55.25 MHz): no station
3    ( 61.25 MHz): no station
4    ( 67.25 MHz): no station
5    ( 77.25 MHz): no station
6    ( 83.25 MHz): no station
7    (175.25 MHz): no station
8    (181.25 MHz): no station
9    (187.25 MHz): no station
10   (193.25 MHz): no station
11   (199.25 MHz): no station
12   (205.25 MHz): no station
13   (211.25 MHz): no station
14   (121.25 MHz): no station
15   (127.25 MHz): no station
16   (133.25 MHz): no station
17   (139.25 MHz): no station
18   (145.25 MHz): no station
19   (151.25 MHz): no station
20   (157.25 MHz): no station
21   (163.25 MHz): no station
22   (169.25 MHz): no station
23   (217.25 MHz): no station
24   (223.25 MHz): no station
25   (229.25 MHz): no station

etc, etc, through over 100 channels...

FWIW, here is the output of

hwinfo --tv

19: PCI 10a.0: 11200 TV Card
[Created at pci.244]
Unique ID: HJNj.s+Tm+MFkcrC
Parent ID: RE4e.f9Q95vpHUcA
SysFS ID: /devices/pci0000:00/0000:00:08.0/0000:01:0a.0
SysFS BusID: 0000:01:0a.0
Hardware Class: tv card
Model: "Brooktree Bt878"
Vendor: pci 0x109e "Brooktree Corporation"
Device: pci 0x036e "Bt878"
Revision: 0x02
Driver: "bttv"
Memory Range: 0xd8000000-0xd8000fff (rw,prefetchable)
IRQ: 201 (no events)
Driver Info #0:
Driver Status: bttv is active
Driver Activation Cmd: "modprobe bttv"
Config Status: cfg=new, avail=yes, need=no, active=unknown
Attached to: #15 (PCI bridge)


And here is the output of lsmod

Module Size Used by

tvaudio 22752 0
tuner 20580 0
nvsound 1535112 0
ipv6 261568 8
iptable_nat 26696 0
iptable_mangle 2752 0
af_packet 22536 2
ipt_state 1856 128
ip_conntrack 47508 2 iptable_nat,ipt_state
ipt_REJECT 6976 4
ipt_limit 2368 6
ipt_LOG 7040 6
iptable_filter 2880 1
ip_tables 18368 7 
iptable_nat,iptable_mangle,ipt_state,ipt_REJECT,ipt_limit,ipt_LOG,iptable_filter
snd_bt87x 13256 0
btaudio 17296 0
bt878 11636 0
bttv 155788 1 bt878
video_buf 22020 1 bttv
firmware_class 10368 1 bttv
i2c_algo_bit 9928 1 bttv
v4l2_common 6016 1 bttv
btcx_risc 4616 1 bttv
i2c_core 24016 4 tvaudio,tuner,bttv,i2c_algo_bit
videodev 9920 1 bttv
shpchp 100644 0
pciehp 97188 0
pci_hotplug 34160 2 shpchp,pciehp
snd_intel8x0 35020 0
snd_ac97_codec 72208 1 snd_intel8x0
snd_pcm 97608 2 snd_bt87x,snd_intel8x0
snd_timer 25604 1 snd_pcm
snd_page_alloc 9928 3 snd_bt87x,snd_intel8x0,snd_pcm
snd_mpu401_uart 7872 1 snd_intel8x0
snd_rawmidi 25060 1 snd_mpu401_uart
snd_seq_device 8072 1 snd_rawmidi
snd 57188 8 
snd_bt87x,snd_intel8x0,snd_ac97_codec,snd_pcm,snd_timer,snd_mpu401_uart,snd_rawmidi,snd_seq_device
nvidia_agp 7708 1
analog 11744 0
gameport 4544 2 snd_intel8x0,analog
parport_pc 37188 0
parport 41416 1 parport_pc
floppy 60176 0
tsdev 7616 0
mousedev 11480 1
psmouse 21832 0
pcspkr 3560 0
rtc 12664 0
evdev 9472 0
ehci_hcd 31428 0
ohci_hcd 21124 0
usbcore 118564 4 ehci_hcd,ohci_hcd
i810_audio 37268 0
ac97_codec 18508 1 i810_audio
soundcore 10272 4 nvsound,btaudio,snd,i810_audio
3c59x 39464 0
forcedeth 17664 0
agpgart 34472 2 nvidia_agp
capability 4488 0
commoncap 7040 1 capability
nvnet 70372 0
nvidia 3470172 12
ide_cd 42464 0
cdrom 40540 1 ide_cd
ext3 125672 10
jbd 63256 1 ext3
mbcache 9092 1 ext3
ide_generic 1344 0
ide_disk 20480 13
amd74xx 14044 1
ide_core 141936 4 ide_cd,ide_generic,ide_disk,amd74xx
sd_mod 17808 0
ata_piix 9092 0
libata 45252 1 ata_piix
scsi_mod 125132 2 sd_mod,libata
unix 28468 339
fbcon 40064 0
font 8256 1 fbcon
vesafb 6688 0
cfbcopyarea 3904 1 vesafb
cfbimgblt 2944 1 vesafb
cfbfillrect 3520 1 vesafb


As far as I can tell, all the required modules are loaded.  So, what 
else might I be missing?  I've already done the requisite Google search, 
and found no useful information.  Although there were a few search 
results that showed other people having the same problem.  
Unfortunately, as almost always happens, those posts received no 
answers, at least not publically.