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

Patrick Boettcher patrick.boettcher at desy.de
Sat Aug 20 13:34:40 CEST 2005

Hi Toni,

On Sat, 20 Aug 2005, Toni Lindroos wrote:
> 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 
> work.
> 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 useful.

I have another (QAM128-proofed) stv0297-driver in a fork of the dvb-kernel 
CVS (can be found on my website), which contains the changes to get it 
working with the CableStar2 card. I just don't have the time to include 
the changes to dvb-kernel. If you want to take a look and maybe try to get 
this stv0297-version working with your TT card, it would be helpful for 
solving the qam128 issue finally.

best regards,

   Mail: patrick.boettcher at desy.de
   WWW:  http://www.wi-bw.tfh-wildau.de/~pboettch/

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