[linux-dvb] FIX: No recovery after lost lock

Andrew de Quincey adq_dvb at lidskialf.net
Sun Sep 4 14:02:21 CEST 2005


On Wednesday 31 Aug 2005 14:16, Jesper Sörensen wrote:
> Johannes Stezenbach skrev:
> >On Mon, Aug 29, 2005 at 01:00:41AM +0200, Johannes Stezenbach wrote:
> >>On Wed, Aug 24, 2005 Marian Durkovic wrote:
> >>>  I found a big thread on linux-dvb list couple of months old, about
> >>> problems with retuning after lost lock.
> >>>
> >>>  I was experiencing the same situation - but only with dvb-kernel
> >>> drivers. My old boxes with 2.4.20 kernel and DVB branch never had this
> >>> problem. The new box was never able to retune even after signal
> >>> degradation by heavy rain or after cable disconnecting/reconnecting.
> >>>
> >>>  My oscilloscope was showing the 22 kHz signal even after lost lock,
> >>> but the card was not able to retune. Restarting the application always
> >>> solved the problem.
> >>>
> >>>  Finally I found the reason - it's the following code in
> >>> dvb_frontend.c:
> >>>
> >>>                        /* if we're tuned, then we have determined the
> >>> correct i nversion */
> >>>                        if ((!(fe->info->caps & FE_CAN_INVERSION_AUTO))
> >>> && (fe->parameters.inversion == INVERSION_AUTO)) {
> >>> fe->parameters.inversion = fe->inversion; }
> >>>
> >>>  If this is commented out, the frontend is able to retune.
> >>
> >>Has anyone had time to look into this? Anyone else seeing the
> >>problem, and if yes does that change fix it?
> >
> >No more people with SAT-equipment willing to test and/or comment
> >on this?
>
> I have a Nova-S-CI too (budget-ci & stv0299) and I've seen some weird
> problems with lock loss on a specific transponder (Thor 1.0°W, 11 229
> MHz, H polarity) but I'm not sure if it is related to this issue. Maybe
> it has something to do with the polarity since most of the other
> transponders (which work fine) use V polarity...?
>
> Symptoms are: good lock at first but then the lock is lost after a
> couple of seconds up to a few minutes and it doesn't retune
> automatically. When this happens it is very reproducable but when I try
> again a few hours later everything can be perfectly fine so I don't know
> what could be causing it?

I have this problem as well at one site only. No idea why it happens, but 
you're not alone.



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