[linux-dvb] [PATCH] Assistance writing patch for Nova-T 500 stuttering problems

Patrick Boettcher patrick.boettcher at desy.de
Mon Jul 30 20:32:49 CEST 2007


Hi Matt,

Based on your Idea I just committed something which will fix your 
problems using a module parameter.

I don't know why Hauppauge has splitted the fix into two, it is not 
useful, both register-changes are required to solve the issue.

By using those settings one will decrease the mobile performance of the 
receiver, but for fixed-reception it is OK.

Can you please try it from my hg repo: http://linuxtv.org/hg/~pb/v4l-dvb/?

regards,
Patrick.

On Thu, 19 Jul 2007, Matt Doran wrote:

> Hi Patrick,
> 
> I tracked down the code that sets up the registers in dib3000mc.c.  I created
> a patch to add a "fix_sfn" module option to the dib3000mc modele.  e.g. when
> fix_sfn 0x01 bit is set, configure register 29 -> 0x1073 ... when fix_sfn 0x02
> bit is set, configure register 108 -> 0x4000.  
> I've tested this with "fix_sfn" set to 3 to enable both fixes, and it doesn't
> cause any regressions.  Tonight I have not had any reception/stuttering
> problems (it doesn't happen all the time), so I'm not sure if it fixes the
> problem..... but I'll continue to use this to see if it successfully resolves
> my issues.  I'll also ask others I know who see this problem to test this fix.
> 
> Can you review this patch?  Does it look right?
> 
> I wasn't sure what to call the module option, or how to describe the options
> ... if you have any suggestions I'd be happy to adjust the patch.
> 
> Regards,
> Matt
> 
> Patrick Boettcher wrote:
> > Hi,
> >
> > I nothing really important happens I'm trying to provide something this or
> > beginning of next week.
> >
> > Patrick.
> >
> > On Sun, 15 Jul 2007, Matt Doran wrote:
> >   
> > > Hi there,
> > >
> > > The Nova-T 500 has some serious problems with some channels in various
> > > locations around Australia. These channels show serious video
> > > break-up/stuttering like there is poor reception, however this is not the
> > > case.   Using other tuners (e.g. other cards, or tuners in TVs), or using
> > > the Nova-T 500 on Windows doesn't exhibit these problems.  I raised this
> > > issue 3 or four months ago
> > > (http://www.linuxtv.org/pipermail/linux-dvb/2007-April/017065.html).
> > >
> > > Patrick Boettcher indicated that it relates to some peculiarities with the
> > > DVB broadcast
> > > (http://www.linuxtv.org/pipermail/linux-dvb/2007-April/017102.html).
> > > The Hauppauge windows drivers now have a registry key
> > > (HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HCW99BDA\Parameters\FixSFN)
> > > that can be used to modify the tuner's behaviour to fix this problem.
> > >
> > > I'd like to work on a patch for the drivers to add a module option
> > > "fix_sfn", that does the same as the windows drivers.  But need to know
> > > what registry settings need to be changed.  If Patrick or someone from
> > > Hauupauge or Dibcom could give me this information, I'd like to develop
> > > the initial patch.
> > >
> > > Thanks in advance,
> > > Matt
> > >
> >> _______________________________________________
> > > linux-dvb mailing list
> > > linux-dvb at linuxtv.org
> > > http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
> > >
> > >     
> >
> >   
> 




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