Documentation idea - was [mythtv-users] howIdidit: Debian+Myth from scratch using mdz'spkgs

[Edward Wildgoose]

I don't know what is causing your problem, but I do know that (unless 
you've done more checking than you report here) your statement that 
"Nothing else has changed as far as software/configuration goes" is rash 
... at least if you and I use "configuration" the same way. A new mobo 
might have changed any of the following:

         IRQ assignments (I see that you do mention something vague about 
this, down toward the end - and you mention changing the slot assignments here)
         IDE chipset
         video (if the mobos used onboard video - or did you move the same 
AGP card?)
         audio chipset (if they use onboard sound - or did you move the 
same PCI card?)
         "hidden" IRQ conflicts (for example, a Winmodem competes for an 
interrupt at the BIOS level even though Linux cannot see or use the device)

Since the problem is with live TV, my first thought is an IRQ problem 
involving the capture card and the VGA card ... Linux won't report this, so 
you'll have to look at the BIOS listing that displays before lilo starts 
the boot process to see it. This seems farfetched, to be honest, but your 
report is somewhat difficult to interpret, so I'm kind of guessing blindly, 
and nothing else suggests itself from what you've reported so far.

It might be easier to offer more certain suggestions if we had a better 
understanding of the problem. "I can't watch live TV" doesn't characterize 
the problem very precisely (what actually happens when you try?), and 
"Something to the effect of" is not a useful way to report error messages 
in your logs (neither is "a funky error"). And the obvious hardware details 
might also serve to suggest something, as well as what Linux distro and 
kernel you are using.

At 12:17 PM 4/8/2003 -0400, Calvin Harrigan wrote:
>Greetings all,
>         I have a question not directly related to mythtv, but...  Yesterday,
>Sunday, I swapped out the motherboard in my mythtv box.  The only other
>thing that changed was the memory, same amount though.  DDR -> SDRAM.  The
>machine seems to work fine, but when it comes to mythtv it behaves
>erratically.
>I can watch pre-recorded programs fine, I use the epg to schedule programs,
>I can even record programs! But for reasons beyond my understanding right
>now I can't watch live TV.  Nothing else has changed as far as
>software/configuration goes.  I initially thought that it was a hardware
>problem, you know something wrong with the TV card setup, gave up on that
>idea when I did a record.  It record for 3 hours without missing a beat.
>After messing with it some more I realised that I was getting was seems like
>hardware/kernel/driver errors.  Something to the effect of:
>
>VIDIOSYNC 0: Invalid Argument
>VIDIOSYNC 1: Invalid Argument
>.
>.
>.
>
>This repeats until I kill the backend or the backend crashes.
>
>I also noticed that if I did a 'dmesg'  I get a funky error about interrupts
>on the tv card and that the driver is resetting it the card.  I moved the
>card to a different slot and that cleared up, not sure what that was about
>because it had it's own interrupt before, but now it's sharing with the nic.
>
>I'm not convinced that it's not a hardware problem and was wondering if
>anyone had any ideas/experiences to help try to solve my problem.