[linux-dvb] Re: High BER's & Glitching with 2.6 kernel, better with 2.4 and 1.0.0-pre2 (Nova-T)

[Johannes Stezenbach <js@convergence.de>]

Dave Smith wrote:
> On Fri, 6 Feb 2004, Johannes Stezenbach wrote:
> 
> > Dave Smith wrote:
> > > 
> > > I'm using a NOVA-T card (grundig_29504-401/saa7146), and a 
> > > 2.4.20 kernel or 2.6.2 kernel for testing.
> > ...
> > > Please can someone give me some pointers.  This problem is stopping me 
> > > from moving over to a 2.6 kernel.
> > 
> > The grundig_29504-401 driver in 1.0.0-pre3 had some gross
> > bugs, but they were corrected in 1.0.1. Could you copy
> > grundig_29504-401.c from 1.0.0-pre2 into 1.0.1 and rebuild?
> > 
> > Does the 1.0.1 driver work for you then? If yes, my guess is
> > that for some reason the simpler and slightly incorrect
> > version of tsa5060_set_tv_freq() in 1.0.0-pre3 works better
> > for you. Could you copy the code in tsa5060_set_tv_freq()
> > from 1.0.0-pre3 into the driver in Linux 2.6.2 and see
> > if that works?
> > 
> > Please report your findings.
> 
> Thanks for the suggestions Johannes.  Both of those suggestions worked, so 
> using the old tsa5060_set_tv_freq() function from 1.0.0-pre2, I now have 
> very good Bit Error Rates whilst running the 2.6.2 kernel and drivers.

Hm, that's interesting...
If your feel up for some more experiments you could check whether
the changed frequency offset (36125000 vs. 36000000) makes the
difference, or the band/chargepump setting.

> So, does this mean it's a fault to my specific card, or to all the 
> NOVA-T's with this chipset?

I don't know, and I don't even have a card with this frontend.
Maybe Holger can comment on this?


Johannes


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