[linux-dvb] Tuning broken in development branch, 2.6.20 for lowest freq channel with TT DVB-C 1500

e9hack e9hack at googlemail.com
Wed Apr 25 23:15:41 CEST 2007


Petri Helin wrote:
> Kari Salmela wrote:
>> Hello
>>
>>  
>>
>> Hardware: Technotrend DVB-C 1500, CI, Conax CAM, Asus P5B
>>
>>  
>>
>> Am I the only one left alone without working system with current
>> development v4l tree? Somewhere between 2.6.18.1 and 2.6.20 (and
>> current mercurial, also) something changed, and tuning to Discovery
>> channel no longer works at least for me. With 2.6.18.1 plain vanilla
>> kernel, Discovery channel on 138 Mhz works fine:
>>
> 
> Well, after going through the changes that might have had effect on
> tuning, I found out the one which had caused this problem. I do not know
> the actual reason behind the change, but the changelog says that it
> was meant to "Fix TD1316 tuner for DVBC". But at least in my case it
> seams to have broken the tuner instead.
> Attached is a patch to revert the change.
>>
>>
>> All the other multiplexes work ok with both setups, except for one HD
>> channel with QAM256, which has some artifacts, but that’s a different
>> issue…  
> 
> Although it is a different issue, I would really like to know if someone
> had any suggestions how to even try to fix it...

Your problem is a result of this change: http://linuxtv.org/hg/v4l-dvb?cmd=changeset;node=e7c424bbf9aa;style=gitweb. It
was started by this mail: http://www.linuxtv.org/pipermail/linux-dvb/2006-November/014461.html. This mail is a little
bit suspect, because dvbc_philips_tdm1316l_tuner_set_params() in budget-ci.c has nothing to do with the Technotrend
Connect C-1200 USB DVB-C adapter. Please revert this dubious change.

- Hartmut



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