[mythtv-users] controlling order of tuner card detection?

Michael Thome mthome at bbn.com
Thu Mar 8 16:16:49 UTC 2007

Cool - excellent writeup!  I suspect I'll end up solving my problem this 

What bugs is the weird non-determinism - I assume what is happening is 
that ivtv and dvb drivers are in a race for video0, even if they are 
loaded in the same (presumably bus) order...  I suppose I could shoehorn 
the pci busid into my alias name somehow and make /dev/video* totally 

Anyway, thanks!

Rod Smith wrote:
> On Sunday 04 March 2007 14:19, Michael Thome wrote:
>> Sometimes, my tuner cards are detected and thus assigned to /dev/videoX
>> numbers in different orders - this wouldn't be an issue except that they
>> have very different connections and features.  Right now, I've got a
>> pvr-150 with both cable and video-in and a hd5500 with qam and backup
>> cable in - if they get detected in the wrong order, /dev/video doesn't
>> have an mpeg encoder, doesn't have an attached cable box to video0, and
>> gets darn nasty reception.  I've been planning to replace the 150 with a
>> 500, but I'm nervous that it'll make things even worse...
>> Is there any way to force detection to proceed in bus-order, presumably
>> not changing unless I swap cards?
> I replied to your query earlier; however, your question inspired me to write a 
> new wiki entry:
> http://www.mythtv.org/wiki/index.php/Device_Filenames_and_udev
> This entry only covers one method of approaching this problem (namely, using 
> udev to create unique device filenames). Other approaches are possible and 
> may be simpler to configure in some (perhaps many) cases. Still, the udev 
> approach is extremely flexible.

*Michael Thome*
BBN Technologies 10 Moulton St, Cambridge MA 02138 USA
phone: +1 617 873 1853

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