[pvrusb2] 24xx hardware instability.

[Martin Andrew Galese]

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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