[linux-dvb] Re: Tuning problems with TT DVB-C 1500 (saa7146 + stv0297) and QAM128

Toni Lindroos tonilind.ml at nic.fi
Sat Aug 20 10:26:54 CEST 2005

Hi all,

I finally got my TT DVB-C 1500 card and (not surprisingly) tuning isn't 
working the way it should be with QAM128 (I'm using kernel 2.6.13-rc3 and 
dvb-kernel from cvs). Disabling the corner detection and adding about 10 
seconds to every timeout in stv0297.c helped enough to get a channels.conf 
generated from scan but tuning is still *very* unreliable and very slow if 
it works at all. Looks like it gets a lock on some channels easier than 
others. Has someone tried and found some reasonably working timeout values 
for stv0297.c and what are they? I'm still playing with them but it's quite 
frustrating without knowing more about how the driver and tuning process 

I've been trying to search the archives for anything even remotely related 
to this problem but nothing I've have found haven't helped to solve the 
problem so far.

Is there a complete datasheet for stv0297 available (just e-mail it to me, 
if you have one...)? Is it waste of time to ask help from Technotrend to 
solve this issue or have they been helpful in the past? The problem seems to 
be that there are no dvb driver developers who can access a network with 
QAM128 - so any official information (register values etc.) should be 

How should I proceed? My programming skills aren't good enough to solve this 
problem but I'm willing to do some debugging and testing. Any help is 
greatly appreciated.

Toni Lindroos <tonilind.ml@*NOSPAM*nic.fi>
Turku, Finland 

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