Twinhan DVB-C Cab-CI tuning problem

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I cannot seem to get the tuner to work on my Twinhan DVB-C Cab-CI.

However, I do notice that scanning goes much faster for frequencies + QAM-rates that I do know to be correct, and slower if a purposely mistune the frequency, or enter the wrong QAM-value (eg. 256 istead of 64). So something seems to work, but tuning status always returns 0x00 ...

Output of "dvbscan -vvv <table>"

using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
initial transponder 314750000 6900000 0 3
tune to: 314750000:INVERSION_AUTO:6900000:FEC_NONE:QAM_64
tuning status == 0x00
tuning status == 0x00
tuning status == 0x00
tuning status == 0x00
tuning status == 0x00
tuning status == 0x00
tuning status == 0x00
tuning status == 0x00
tuning status == 0x00
tuning status == 0x00
WARNING: >>> tuning failed!!!
tune to: 314750000:INVERSION_AUTO:6900000:FEC_NONE:QAM_64 (tuning failed)
tuning status == 0x00
tuning status == 0x00
tuning status == 0x00
tuning status == 0x00
tuning status == 0x00
tuning status == 0x00
tuning status == 0x00
tuning status == 0x00
tuning status == 0x00
tuning status == 0x00
WARNING: >>> tuning failed!!!
ERROR: initial tuning failed
dumping lists (0 services)
Done.


I found the discussion in September 2005 about the tuning problems, but AFAICS the patches are in my drivers (should be, because I downloaded and installed using mercury last week).

How can obtain more information what is the problem?

Thank you and best regards,

Z.


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