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

Matt Doran matt.doran at papercut.biz
Tue Jul 31 01:37:16 CEST 2007

Hi Patrick,

Thanks for that Patrick. My patch fixed the problem for me and someone 
else I know with the same card.   I'll try the fix tonight, and also 
will get the other guy to test it.

What module parameter do I need to use?   Do I also need the new firmware?

I looked through your repository and couldn't see the change that fixed 
the problem, what was the revision? ... e.g. my patch added a module 
parameter to dib3000mc, but I can see a new module parameter there.


Patrick Boettcher wrote:
> 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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