[mythtv-users] Low volume on second PVR-150

[John Biundo]

Michael T. Dean wrote:

> Backend logs.  If you've enabled logging to the database, these are even 
> visible through MythWeb.  (Unless something new has been added, the logs 
> are the only place to find out which capture card was used to record a 
> show. :)

Michael, thanks for that.  Yes, I'm pretty sure there's some info in the 
logs that will guide me.  I was going to poke around some more before 
asking follow-up questions on this topic, but since you offered some 
info, I'll ask my full set of questions.  Maybe it'll speed up my debugging.

How does Myth arrive at a decision about which tuner card to use for 
watching LiveTV?  Here's what I did and thought would happen:

- added second PVR-150
- noted that it was detected by examining dmesg.  Assumed that card 1 
was the new card (first card is card 0), though I guess order of 
detection is probably what determines the card # assigned by ivtv (??). 
  Here's where confusion begins.
- still assuming the new card is card 1, and running mythtv-setup, I add 
a new capture card for /dev/video1 (again, assuming this is the new card)
- in mythtv-setup, add new input for tuner1

So... I assumed Myth would default to using tuner0 (assuming it's my 
original card) for watching LiveTV.

However, when I started mythfrontend to watch livetv, the OSD said it's 
using tuner 1.  And the volume was way too low.

So... this is the genesis of my earlier question about low volume on the 
second card.  But I'd also like to understand more about how these cards 
are detected, identifiers assigned, and default capture card for LiveTV 
chosen.  First because I need that info to continue debugging.  But also 
because I'd like, until I solve the problem, to use the card with the 
"normal" volume as the default LiveTV card.

Hope this makes some sense, and thanks for any input.

John