[mythtv-users] HD-5500 will not tune NTSC channels.

Thomas Kessler electronikjunkie at gmail.com
Tue Apr 24 01:54:23 UTC 2007


What would the line in modprobe.conf look like for ivtv and cx8800?

TK

On 4/23/07, R. G. Newbury <newbury at mandamus.org> wrote:
>
> Thomas Kessler wrote:
> > On 4/22/07, R. G. Newbury <newbury at mandamus.org> wrote:
> >>
> >>
> >> The post 12618 problem only affects scanning on the ATSC side of
> things.
> >> Your post was unclear: do you have TWO different zap2it channel
> lineups?
> >>
> >> When you switch modes it is as if you swapped cards completely. So you
> >> need a lineup distinct to NTSC channels. Your error message about wrong
> >> modulation implies to me that you are trying to tune an NTSC channel,
> >> using an ATSC-channel tuning method (because myth thinks it is dealing
> >> with an ATSC channel). That fails, of course.
> >>
> >> If you HAVE defined 2 lineups, it sounds like your NTSC channel listing
> >> has the same modulation value as the ATSC....
> >>
> >> For NTSC tuning, your card would not (properly) use the dtv_multiplex
> >> table... which is the one place where modulation appears. (It should be
> >> qam_256 for digital cable: in mysql:
> >>
> >> select modulation from dtv_multiplex;
> >>
> >> Geoff
> >
> >
> > I was in mythtv-setup and I noticed that both my HD-5500 NTSC and
> PVR-350
> > were being assigned to /dev/video0. I know I can add something to
> > /etc/modprobe.d/aliases to assign hardware to a specific devices. Does
> > anyone know what I might put to fix this? Also when I originally went to
> > get
> > NTSC working I only had an analog listing in my zap2it account and I
> only
> > setup my HD-5500 card with one input going to the NTSC connection and
> > nothing to the ATSC side of the card in setup.
> >
> > TK
>
> Since the cx88 modules are loaded by the kernel very early in the boot
> process, I have recommendeded that people blacklist all the cx88..
> modules, so that they will not unexpectedly be loaded. (The kernel will
> then recognize that the card is there, but not load the module).
> We control the load by adding a single line to rc.local: 'modprobe
> cx88_dvb'. Once installed, this will (should!) result in udev creating
> the /dev/dvb tree for the ATSC side of the card..
>
> Then your usual modprobe.conf need only contain the ivtv line for your
> PVR. It will end up at /dev/video0..
>
> Finally another line in modprobe.conf can load cx8800 for the NTSC side
> of the HD5500. It will then be assigned to /dev/video1.
>
> This process means that the PVR card never changes its assigned
> position. The /dev/video1 and /dev/dvb/adaptor0 adapters will appear and
> disappear as the controlling module is swapped.
>
> And you will have to start with another lineup at labs.zap2it.com.
>
>
>
>               R. Geoffrey Newbury
>
>
>         Helping with the HTTP issue
> <a href="http://www.w3.org/Protocols/">HTTP</a>
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