[linux-dvb] Hauppauge DVB-c rev2.1: losing very strong signal after 3 seconds

[Tobias Boesch <brake@hispeed.ch>]

Hi!

I am using a Hauppauge DVB-c rev2.1 card, which works fine for about 3 
seconds (composite out and xawtv pictures are fine). However after 3 
seconds the card seems to lose the signal. See dvbtune output below. The 
behaviour is the same on subsequent invocations of dvbtune.

The card is installed in a DELL PowerEdge 1650 server and works for at 
least 20 min using Windows 2000 (I didn't want to test any longer). It 
does exhibit above described behaviour using either one of 
linux-2.4.20-18.8, linux-2.6.0-test1 or linux-2.6.0-test1-ac2 with the 
appropriate kernel-dvb drivers.

Is this a known problem? Are there any workarounds or patches? If not 
where do I start looking?

Any help, guidance or support would be greatly appreciated.

Thanks,

Tobias


Tuning to the signal:

[root@pe-11 /usr/src/cvs/dvbtune]# ./dvbtune -s 6900 -I 2 -f 418000000 
-v 656 -a 657
Using DVB card "VES1820 based DVB-C frontend"
tuning DVB-C to 418000000, srate=6900000
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI 
FE_HAS_SYNC
Bit error rate: 50
Signal strength: 65535
SNR: 61423
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI 
FE_HAS_SYNC
A/V/TT Filters set


Observing:

[root@pe-11 /usr/src/cvs/dvbtune]# ./dvbtune -s 6900 -I 2 -f 418000000 
-v 656 -a 657 -m
Signal=65535, Verror=268660, SNR=61680dB, BlockErrors=-1, (S|L|C|V|SY|)
Signal=65535, Verror=30, SNR=61680dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=65535, Verror=30, SNR=61680dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=32896, Verror=30, SNR=0dB, BlockErrors=0, ()
Signal=32896, Verror=30, SNR=0dB, BlockErrors=0, ()
Signal=32896, Verror=30, SNR=0dB, BlockErrors=0, ()
Signal=32896, Verror=30, SNR=0dB, BlockErrors=0, ()


This is what the monolithic 2.6 kernel had to say during boot:

Linux video capture interface: v1.00
saa7146: register extension 'dvb'.
saa7146: found saa7146 @ mem d0848000 (revision 1, irq 20) (0x13c2,0x0002).
saa7146_vv: saa7146 (0): registered device video0 [v4l2]
DVB: registering new adapter (Technotrend/Hauppauge PCI rev2.1).
drivers/media/dvb/frontends/ves1820.c: setup for tuner sp5659c
DVB: registering frontend 0:0 (VES1820 based DVB-C frontend)...
ttpci_eeprom_read_encodedMAC
Technotrend/Hauppauge PCI rev2.1 adapter 0 has MAC addr = 00:d0:5c:21:83:fa
encoded MAC was be:50:63:35:dc:63
DVB: AV7111(0) - firm f0240009, rtsl b0250018, vid 71010068, app 8000261a
DVB: AV7111(0) - firmware supports CI link layer interface
av7110(0): adac type set to 0
av7110: found av7110-0.




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