[mythtv-users] channels/DVB card go missing

[Nick Rout]

On Mon, Dec 6, 2010 at 2:18 PM, mike at grounded.net <mike at grounded.net> wrote:
>> The only thing I can think of is that there's something about using both
>> the WinTV-Nova-HD-S2 and WinTV HVR-1600 in the same box which just doesn't
>> work. I don't have any of these weird problems when I pull the DVB card out.
>
> They appear to be conflicting in some way because after I get these errors, I find that the cards have gone missing in the mythtv-setup.
>
> Both /dev/dvb/adapter0/frontend0 and /dev/dvb/adapter1/frontend0 end up with ERROR_OPEN Subtype: DVB-S! and ATSC respectively.

is it possible that your backend is starting before the kernel has
finished loading the modules for your tuner cards? It then can't see
them and things wil break. The kludgy trick is to set a few seconds
delay in the backend startup script. sleep 10 pauses for 10 seconds.

the other alternative theory is that the cards get swapped on startup.
sometimes modules get loaded in a different order and what was
/dev/dvb/adapter0/frontend0 on one boot will become
/dev/dvb/adapter1/frontend0 next time. You need to look at udev rules
to keep them consistent.