[linux-dvb] Re: Regaining lock

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

On Tuesday 01 Jun 2004 11:48, Hamish Moffatt wrote:
> On Tue, Jun 01, 2004 at 10:39:56AM +0200, Johannes Stezenbach wrote:
> > Johannes Stezenbach wrote:
> > > Hamish Moffatt wrote:
> > > > The relock behaviour is more helpful. For reasons I don't understand,
> > > > my dpanda card lost lock a couple of times tonight while recording
> > > > with MythTV, and unfortunately then I get nothing until the next
> > > > channel change (or Myth restart).
> > > >
> > > > OTOH if user space is meant to monitor and initiate a retune, I'll
> > > > work on a patch for Myth...
> > >
> > > It is not. There must be a bug in dvb_frontend.c or tda1004x.c.
> >
> > BTW, you didn't say which driver version you use. I hope we are
> > not talking about old bugs?
>
> I hope not. I'm using linux 2.6.4 out of the box.

That will have the old version unfortunately. 2.6.6/CVS have the frontend 
fixes.

> >From cvsweb it looks like tda1004x.c's changes have mostly been related
>
> to firmware loading since then. (Unfortunately the CVS version number
> isn't in the file anywhere.) Same for dvb_frontend.c.
>
> I'll try to debug it then, sometime soon.

A sample run I just did with CVS head on 2.6.6 (tda10045h based). You can 
probably spot where I unplugged it :)

burble:/tmp/dvbtune# ./dvbtune -c 1 -f 634166670 -m
Using DVB card "Philips TDA10045H"
tuning DVB-T (in United Kingdom) to 634166670 Hz, Bandwidth: 0
polling....
Getting frontend event
FE_STATUS:
polling....
Getting frontend event
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
Event:  Frequency: 634166670
Bit error rate: 0
Signal strength: 52685
SNR: 65278
FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
Signal=52685, Verror=0, SNR=65278dB, BlockErrors=-1, (S|L|C|V|SY|)
Signal=52685, Verror=0, SNR=65278dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=52428, Verror=0, SNR=65278dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=52685, Verror=0, SNR=65278dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=52685, Verror=0, SNR=65278dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=52685, Verror=0, SNR=65278dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=52685, Verror=0, SNR=65278dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=52685, Verror=0, SNR=65278dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=52685, Verror=0, SNR=65278dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=52685, Verror=0, SNR=65278dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=43433, Verror=131070, SNR=0dB, BlockErrors=0, ()
Signal=43947, Verror=131070, SNR=0dB, BlockErrors=0, ()
Signal=52685, Verror=131070, SNR=32896dB, BlockErrors=0, ()
Signal=52685, Verror=131070, SNR=45232dB, BlockErrors=0, ()
Signal=52685, Verror=131070, SNR=45489dB, BlockErrors=0, ()
Signal=52685, Verror=4, SNR=65278dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=52685, Verror=0, SNR=65278dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=52685, Verror=2, SNR=65278dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=52685, Verror=0, SNR=65278dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=52685, Verror=0, SNR=65278dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=52685, Verror=2, SNR=65278dB, BlockErrors=0, (S|L|C|V|SY|)