[linux-dvb] Nova-T (TT L64781) TS Continuity problems

Allan Guild lists at bitsnpieces.org.uk
Sun May 8 15:50:15 CEST 2005


Johannes,

Thank you very much for your response.  It will be a couple of days
before I have another chance to play around.  I will post back what I
find.

Thanks again,

Allan

On Sun, 2005-05-08 at 15:33 +0200, Johannes Stezenbach wrote:
> On Sat, May 07, 2005 at 06:31:19PM +0100, Allan Guild wrote:
> > I'm having problems getting an old TT (L64781 frontend) based Nova-T
> > working with the current DVB drivers and a 2.6.11 kernel.
> > 
> > The video and audio hangs for a few seconds once or twice a minute and
> > the debug messages in /var/log/syslog report "TS continuity errors".
> > 
> > This card works perfectly with the DVB drivers in a Mandrake 9.2 stock
> > kernel (2.4.22).
> 
> I have no idea what Mandrake has in their 2.4 kernels. Do you
> have more information?
> 
> > I am getting the same problems described above using a snapshot from
> > before the frontend refactoring (here I used the same grundig frontend
> > as with 2.4.22 kernel) and a 2.6.8 kernel.
> > 
> > I also have a connexant based Nova-T that is working fine under both my
> > 2.6.x setups (I believe that this card requires a 2.6 kernel).
> > 
> > >From browsing the archives, I noticed that similar problems with a
> > tda10021 frontend were fixed with a register change.  I'm under the
> > impression that this fix is not relevant for my setup, but please
> > correct me if I'm wrong.
> > 
> > I'm more than willing to try different things to try and get this
> > working, but I don't really know where to start.
> 
> You could compare the old and new drivers for differences
> in register settings (both initial and what set_frontend()
> and grundig_29504_401_pll_set() in budget.c does) and timing.
> 
> A good start might be to load the driver (dvb-core) with
> frontend_debug=1 and see what it does. Then maybe look at
> l64781_get_tune_settings() and play with the values. I would
> try to set step_size and max_drift to 0 to disable zig-zag
> (not that usefule IMHO for dvb-t) and maybe increase min_delay_ms.
> http://www.linuxtv.org/mailinglists/linux-dvb/2004/03-2004/msg00288.html
> 
> Please report your results.
> 
> HTH,
> Johannes
> 
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