[linux-dvb] Re: Full featured card summary

[Andrew de Quincey <adq_dvb@lidskialf.net>]

On Sunday 14 March 2004 22:27, Holger Waechtler wrote:
> On Sunday 14 March 2004 13:11, Oliver Endriss wrote:
> > On Sunday 14 March 2004 10:27, Robert Schlabbach wrote:
> > > From: "Heino Goldenstein" <heino.goldenstein@t-online.de>
> > >
> > > > Helmut Auer wrote:
> > > > > These settings are not working for me, but the long version
> > > > > from Oliver will:
> > > > >
> > > > > S19.2E  11700 V  9750 v [E0 10 38 F0] [E1 10 38 F0] [E1 10 38 F0]
> > > > > ...
> > > >
> > > > maybe your sat-cable does not transmit the DiSEqC-command reliable
> > > > and it needs some retransmits until your multiswitch it understand.
> > >
> > > Or maybe he just has a setup with _cascaded_ switches, which require
> > > repeating the DiSEqC sequence for any second or third level switches,
> > > which may not be connected to the bus the first or second time the
> > > command is sent.
> >
> > IIRC I added the retransmissions because switching was not 100%
> > reliable (with driver 0.9.4 and vdr 1.0.4, long time ago).
> > As I don't have a logic analyser, I was never able to track down the
> > real problem. Anyway, Eutelsat recommends to repeat the sequence, and
> > it increases reliability, so I never changed it...
> >
> > @Klaus:
> > Please change the "Optimized for full DiSEqC" sequence in diseqc.conf
> > of the vdr tar-ball, because some frontends do not turn on LNB power by
> > default.
>
> it's a bug in a particular frontend driver then, it needs to get fixed
> there.
>
> If you specify a bus voltage of 13 or 18V you definitely don't mean
> VOLTAGE_OFF but expect the LNBP working, everything else is a bug.

Yeah, it seemed to have changed from being set to VOLTAGE_13 in the 
initialisation tables to being set to VOLTAGE_OFF by default... somewhere 
between the 1.0.1 and the 1.1.0 release.

Defaulting to VOLTAGE_OFF makes sense though; no point powering up the LNB 
until its actually needed. What do you think of Johannes' idea of it auto 
powering up on frontend open?


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