[pvrusb2] 24xx hardware instability.

[Barry Jett]

Martin,

I setup a recording schedule of continuous 30 minute recordings,
each on a different channel.

While I can't play the recordings through my VNC connection, I do
see from Mythweb about 1.3-1.4 gigs per rec, and a good png pic
for each recording.

I do see, in dmesg, a couple of ioctl errors ... but apparently this
wasn't something that affected the recordings.

I'll try this scenario again this weekend and let you know if I see
anything, but from this initial test I don't see any problems.

Barry



>From: Martin Andrew Galese <martin at galese.net>
>Reply-To: Communications nexus for pvrusb2 driver <pvrusb2 at isely.net>
>To: Communications nexus for pvrusb2 driver <pvrusb2 at isely.net>
>Subject: Re: [pvrusb2] 24xx hardware instability.
>Date: Fri, 31 Mar 2006 09:57:27 -0500
>
>Hi Barry,
>
>The common pattern is a mythbackend process recording a series of shows.
>To decompose that, I assume that it's a channel tune, start record, end
>record, channel tune, start record, stop record, repeat.
>
>The number of cycles that takes varies, and apparently randomly. I've
>never had it with fewer than 3 cycles. I have, rarely, seen it go over
>6. I'd say there's a 30%-50% change that the 4th recording fail.
>
>The failure state is either a) no output (file size 0b) or b) a full
>size mpeg2 file, but either all black or black with crazy red lines. In
>the log, the pvrusb2 driver (or possibly the cx25840 log) detected that
>the cx25840 went into a bad state. I use the term "wedged" because
>that's what Mike used to describe it.
>
>It's possible that I just have a bad unit, though I don't think this is
>heat related or anything obvious like that.
>
>On Fri, 2006-03-31 at 14:31 +0000, Barry Jett wrote:
> > Martin,
> >
> > I'd be willing to try and replicate this problem on my system.  Can you 
>give
> > a scenario to try that's likely to produce the problem....do I need to 
>just
> > record a 6 hour show ?
> >
> > And what exactly does "wedged" mean ?
> >
> > Barry
> >
> >
> > >From: Martin Andrew Galese <martin at galese.net>
> > >Reply-To: Communications nexus for pvrusb2 driver <pvrusb2 at isely.net>
> > >To: Communications nexus for pvrusb2 driver <pvrusb2 at isely.net>
> > >Subject: [pvrusb2] 24xx hardware instability.
> > >Date: Fri, 31 Mar 2006 09:22:24 -0500
> > >
> > >Hi Mike,
> > >
> > >I wanted to let you know that I'm still seeing occasions where the
> > >cx25840 gets wedged. The timing seems to be random, but definitely is
> > >related to the number of "shows" recording by mythtv. The recording 
>time
> > >doesn't seem to matter. As in, I can reliable record a continuous 6 
>hour
> > >show, but I can only actually record a series of 6, 1 hour shows, 
>10-15%
> > >of the time. After 3 distinct recordings (and almost never before) 
>there
> > >seems to be a good chance that the cx25840 wedges.
> > >
> > >I had thought this was fixed with the mpeg2 garbage filter, but that
> > >only seemed to make the device somewhat more stable.
> > >
> > >Has anyone else had this issue? Have you seen it?
> > >
> >
> > < snip >
> >
> >
> > _______________________________________________
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> > pvrusb2 at isely.net
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>
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