[mythtv-users] Backend crashing/locking up
Poobah
poobah at techsquadron.com
Wed Mar 10 00:14:08 EST 2004
Mike,
I had a very similar problem, but my kernel log had an error in
the ivtv driver with "giving up pending DMA clear." It also died within
5-10 seconds. Turned out to be a IRQ conflict between one of the
PVR-250 capture cards and one of the 2 netcards I had in the backend
(the one that the frontend streamed off of). I switched my alias eth0
and alias eth1 in /etc/modules.conf and the Ethernet cables - it works
great now. I found the conflict through lspci -v.
The other thing I found in searching for it is that the ivtv
driver is not SMP friendly, but that wasn't a factor in my case.
Hope you find it!
Mark Hanson
-----Original Message-----
From: Mike Drons [mailto:mdrons at ins.com]
Sent: Tuesday, March 09, 2004 21:35
To: 'Discussion about mythtv'
Subject: RE: [mythtv-users] Backend crashing/locking up
That makes sense then (since I don't have /dev/fb1). The correct
modules
are loading... What version of IVTV should I use? The 1.9 or the
latest
from CVS?
Should I upgrade to CVS of Mythtv? Is this a bug in Mythtv?
Michael Drons
INS
mdrons at ins.com
-----Original Message-----
From: Patrick Snead [mailto:PSnead at infosysnetworks.com]
Sent: Tuesday, March 09, 2004 3:55 PM
To: mdrons at ins.com; Discussion about mythtv
Subject: RE: [mythtv-users] Backend crashing/locking up
Hi Mike,
> -----Original Message-----
> From: Mike Drons [mailto:mdrons at ins.com]
> Sent: Tuesday, March 09, 2004 12:29 PM
> To: 'Carl'; 'Discussion about mythtv'
> Subject: RE: [mythtv-users] Backend crashing/locking up
>
>
> I don't have a /dev/fb1 device? I am I missing something in
> my kernel or is
> it someplace else since I am running devfs as part of gentoo?
>
You won't have any /dev/fb (i.e. frame buffer devices) because you are
using
a PVR-250. The PVR-350 (with on-board hardware encoding AND decoding)
uses
the additional ivtv modules that load the frame buffer. With the
PVR-250,
you should not be loading modules saa7127 and ivtv-fb.
- Patrick Snead
psnead at infosysnetworks.com
> Mike
>
>
> -----Original Message-----
> From: Carl [mailto:mythtv at carldunham.com]
> Sent: Tuesday, March 09, 2004 1:21 AM
> To: mdrons at ins.com; Discussion about mythtv
> Subject: Re: [mythtv-users] Backend crashing/locking up
>
> So 'cat /dev/video0 > /tmp/t.mpg' runs the "encoder", and 'dd
> if=/tmp/t.mpg
> of=/dev/video16 bs=65536' runs the "decoder" (in quotes
> because supposedly
> it's the other way around, but I can't grok that). Sometimes
> ivtv chokes
> doing these things, but by far the biggest source of trouble is the
> framebuffer interactions that produce the on-screen display,
> program guide,
> etc. This can be touched by doing 'ivtvfbctl /dev/fb1
> -senddma', among other
>
> things.
>
> Anyway, there is a lot of work going on to resolve this,
> check out the IVTV
> archives....
>
>
> On Tuesday March 9 2004 00:41, Mike Drons wrote:
> > I have just upgraded to a PVR250 card and my backend is
> crashing when
> > watching live tv after about 2 minutes.
> >
> > I have an AMD 2400 with a nvidia gforce2 card running gentoo.
> >
> > I have mythtv .14 from an ebuild.
> >
> > This is the only error I get on the backend.
> > 2004-03-07 23:51:50 Changing from None to WatchingLiveTV
> > Couldn't read data from the capture card in 15 seconds.
> Game over, man.
> >
> > Doing a cat /dev/video0 > /tmp/t.mpg will capture for over
> an hour, so I
> > don't think it is the ivtv driver. I saw some discussion
> on this issue,
> > but no one every says what solved the issue.
> >
> > I have made sure that the pvr250 has a dedicated IRQ (IRQ
> 7). I am using
> > IVTV 1.9 drivers for the card.
> >
> > Michael Drons
> > INS
> > mdrons at ins.com
>
> --
> Howard Dean for America
> http://www.DeanForAmerica.com
>
>
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