[linux-dvb] Re: STV0297's descrambler sync detector failed to lock

Kein Yuan kein.yuan at gmail.com
Tue Apr 12 05:10:18 CEST 2005

Thanks Patrick, I will try your code later, and  you are right, I am
not haveing a DVB-C card instead I am working on a STB.

Best regards,


On Apr 12, 2005 4:47 AM, Patrick Boettcher <patrick.boettcher at desy.de> wrote:
> Hi Mika
> On Mon, 11 Apr 2005, Mika Sorsa wrote:
> > Based on earlier messages in various blogs, it appears a few dvb-c viewers
> > with STV0297 have tuning problems in some circumstances.
> >
> > I've resolved mine by modifying the frontend driver by increasing those
> > timeouts that expire and adjusting the pwm value so that it gets locked
> > also on QAM-128 modulated frequencies.
> Interesting. I assume you use the Nexus-CA or the Technotrend aquivalent?
> If I got Kein correctly, he is not using such a card, but a STB or
> something.
> I modified the dvb-kernel-driver to work with the CableStar2 (the DVB-C
> clone of the SkyStar2).
> I did not commit it to CVS yet, because it breaks support for the
> Nexus-CA. The problem is, with the current stv0297-driver the CableStar2
> doesn't get a lock, but with my modifications (along with some
> beautifications) the Nexus-CA is failing.
> I haven't had the time yet, to figure out which stv0297-parameters are
> card-specific to fix it again.
> > I suspect some of the other register values are not treated correctly either,
> > since e.g. reading the BER values does not give meaningful results.
> > I don't have idea where to get the data sheets, I cannot correct those.
> I attached my current patch, which changes the flexcop-driver to support
> the CableStar2 and changes the stv0297 in order to work with it.
> It would be nice if you or someone else could have a look into it and
> maybe fix the Nexus-CA support. Please try to keep the beautifications :).
> Thanks in advance.
> Patrick.
> PS: The patch inside the archive can be applied as usual and the
> stv0297_priv.h has to be copied to
> dvb-kernel/linux/driver/media/frontends/
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