[linux-dvb] Scan detects no channels

Tom Lanyon tom at netspot.com.au
Fri Dec 28 04:28:49 CET 2007


Hi all,

I just installed a Bt878 DVB-T card into a machine running kernel  
2.6.23; the card was detected and all the /dev/dvb nodes were created,  
but a 'dvbscan' is unable to find any channels.

I checked that the initial scanning file has the correct frequencies  
for my area (it does). The card is plugged into a large outdoor  
antenna, which is able to pick up the same channels when plugged into  
regular digital set-top-box.

How can I debug this further? More information below.

Regards,
Tom

# dmesg | egrep -i 'bttv|bt878|dvb'
bttv: driver version 0.9.17 loaded
bttv: using 8 buffers with 2080k (520 pages) each for capture
bttv: Bt8xx card found (0).
bttv0: Bt878 (rev 17) at 0000:01:08.0, irq: 18, latency: 32, mmio:  
0xfdeff000
bttv0: detected: Twinhan VisionPlus DVB [card=113], PCI subsystem ID  
is 1822:0001
bttv0: using: Twinhan DST + clones [card=113,autodetected]
bttv0: gpio: en=00000000, out=00000000 in=00f100fe [init]
bttv0: tuner absent
bttv0: add subdevice "dvb0"
ir-kbd-i2c: i2c IR (Hauppauge) detected at i2c-0/0-001a/ir0 [bt878 #0  
[hw]]
bt878: AUDIO driver version 0.0.0 loaded
bt878: Bt878 AUDIO function found (0).
bt878_probe: card id=[0x11822],[ Twinhan VisionPlus DVB ] has DVB  
functions.
bt878(0): Bt878 (rev 17) at 01:08.1, irq: 18, latency: 32, memory:  
0xfdefe000
DVB: registering new adapter (bttv0)
DVB: registering frontend 0 (DST DVB-T)...

#  ls -l /dev/dvb/adapter0/
total 0
crw-rw---- 1 root video 212, 4 Dec 26 22:30 demux0
crw-rw---- 1 root video 212, 5 Dec 26 22:30 dvr0
crw-rw---- 1 root video 212, 3 Dec 26 22:30 frontend0
crw-rw---- 1 root video 212, 7 Dec 26 22:30 net0

# dvbscan /usr/share/dvb/dvb-t/au-Adelaide
scanning /usr/share/dvb/dvb-t/au-Adelaide
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
initial transponder 226500000 1 3 9 3 1 1 0
initial transponder 177500000 1 2 9 3 1 2 0
initial transponder 191625000 1 3 9 3 1 1 0
initial transponder 219500000 1 3 9 3 1 1 0
initial transponder 564500000 1 2 9 3 1 2 0
 >>> tune to:  
226500000 
:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4 
:FEC_AUTO:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_16:HIERARCHY_NONE
WARNING: >>> tuning failed!!!
 >>> tune to:  
226500000 
:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4 
:FEC_AUTO:QAM_64 
:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_16:HIERARCHY_NONE (tuning failed)
WARNING: >>> tuning failed!!!
 >>> tune to:  
177500000 
:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_2_3 
:FEC_AUTO:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_8:HIERARCHY_NONE
WARNING: >>> tuning failed!!!
 >>> tune to:  
177500000 
:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_2_3 
:FEC_AUTO:QAM_64 
:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_8:HIERARCHY_NONE (tuning failed)
WARNING: >>> tuning failed!!!
 >>> tune to:  
191625000 
:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4 
:FEC_AUTO:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_16:HIERARCHY_NONE
WARNING: >>> tuning failed!!!
 >>> tune to:  
191625000 
:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4 
:FEC_AUTO:QAM_64 
:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_16:HIERARCHY_NONE (tuning failed)
WARNING: >>> tuning failed!!!
 >>> tune to:  
219500000 
:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4 
:FEC_AUTO:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_16:HIERARCHY_NONE
WARNING: >>> tuning failed!!!
 >>> tune to:  
219500000 
:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_3_4 
:FEC_AUTO:QAM_64 
:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_16:HIERARCHY_NONE (tuning failed)
WARNING: >>> tuning failed!!!
 >>> tune to:  
564500000 
:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_2_3 
:FEC_AUTO:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_8:HIERARCHY_NONE
WARNING: >>> tuning failed!!!
 >>> tune to:  
564500000 
:INVERSION_AUTO:BANDWIDTH_7_MHZ:FEC_2_3 
:FEC_AUTO:QAM_64 
:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_8:HIERARCHY_NONE (tuning failed)
WARNING: >>> tuning failed!!!
ERROR: initial tuning failed
dumping lists (0 services)
Done.


--
Tom Lanyon
Systems Administrator
NetSpot Pty Ltd





More information about the linux-dvb mailing list