[linux-dvb] [PATCH]Fix a bug in scan, which outputs the wrong frequency if the current tuned transponder is scanned only

Alex Betis alex.betis at gmail.com
Mon Dec 8 21:36:17 CET 2008

On Mon, Dec 8, 2008 at 10:21 PM, e9hack <e9hack at googlemail.com> wrote:

> Alex Betis schrieb:
> > There is no need for NIT message. I've added query from driver for
> currently
> > tuned parameters - should work for DVB-T and DVB-C users. DVB-S/S2 will
> get
> > IF frequency, which is not the real transponder frequency.
> > Please update to latest version.
> > Your other patch for DVB-C scan is also there.
> >
> > Let me know if it helps.
> >
> It works with the stv0297 and the tda10021 frontend. If the transponder was
> tuned with the
> modulation QAM_AUTO, it would be better to read the current modulation from
> the frontend.

All the tuned parameters are read from the frontend, the problem is that the
frontend returns the values that were used to tune, not the real tuned
values, so if tuning was done with QAM_AUTO, scan-s2 output will not include
modulation since frontend returned QAM_AUTO.

> Currently, QAM_AUTO isn't implemented for a DVB-C frontend, but I'm working
> on an
> implementation for the stv0297.
> Regards,
> Hartmut
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