[mythtv-users] mythtvsetup can't see dvb cards after kernel update

R. G. Newbury newbury at mandamus.org
Mon Jul 9 20:32:32 UTC 2012

On 07/08/2012 07:32 AM, John Pilkington wrote:

>>> Just cross posting this thread:
>>> http://www.gossamer-threads.com/lists/mythtv/mythtvnz/522430#522430
>> That thread picked up on Lawrence's patch and reported success after
>> changing the dtv_multiplex mod_sys setting to DVB-S;  in my table it's
>> UNDEFINED, but the doxygen reference says that only DVB-S and DVB-S2 are
>> supported atm.  I'm using dvb-t hardware, so neither seems relevant.
>> Anyway, I wouldn't expect presence or absence of that field to affect
>> myth's /detection/ of the hardware, which is what I'm using as the
>> indicator of the problem.  This is v0.24.3-2-ge12af86.
>> _______________________________________________
> I've put a reference to this here:  it looks as if that is what has
> changed.
> Don't customize V4L/DVB tuners or frontends
> https://bugzilla.redhat.com/show_bug.cgi?id=825203#c9

Not sure if it is the same actual problem, but on Fedora 17 with kernel and, I had a similar problem with an Hauppauge 2250 ATSC 
digital. Dmesg found the card, but could not, in the end, properly 
initialize it. The error message implied that a module was missing, but 
it had in fact been modprobed. But was actually being left unused.

I fixed it by removing the three relevant modules (saa7164, and s5h1411, 
tda18271) and re-modprobing them in the reverse order. The reporting in 
dmesg was quite different as the firmware loading was different and 
everything initialized.

I could then azap tune a channel, cat it to a file and play it with 
mplayer. Mythtv-setup ( trunk ) still has some problems with it. It 
could not instantly probe the card and I only get it to "see" 
/dev/dvb/adapter0 on about the 3rd try while adapter1 was immediate. I 
was not sure that it had actually recognized the card when I continued 
on to the next step. But it had in fact done so despite its own 
indications to the contrary.

So there may be a couple of things going on here. It appears  that it is 
now a good precautionary measure to test the card installation 
thoroughly *before* adding it to mythtv, This has not been required for 
some years in my experience.


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