[mythtv] Any suggestions on odd DVB problem - no data from card..

[George Styles]

(Send to user list, but I realised that developers were more likely to be
able to clue me up)

Hi,

I am running a fairly old mythtv install, that has been working for months
OK.
Recently, its started getting periods of DVB#0 Rec: WARNING - No data from
card in 3250 milliseconds. etc
in the backend.

Nothing has changed in terms of aerial, DVB card, etc.

Whats wierd though is that the outage is ALWAYS 4250ms then it returns to
normal (eg

2006-03-07 19:38:29.808 DVB#0 Rec: WARNING - No data from card in 250
milliseconds.
2006-03-07 19:38:30.068 DVB#0 Rec: WARNING - No data from card in 500
milliseconds.
2006-03-07 19:38:30.328 DVB#0 Rec: WARNING - No data from card in 750
milliseconds.
2006-03-07 19:38:30.588 DVB#0 Rec: WARNING - No data from card in 1000
milliseconds.
2006-03-07 19:38:30.848 DVB#0 Rec: WARNING - No data from card in 1250
milliseconds.
2006-03-07 19:38:31.108 DVB#0 Rec: WARNING - No data from card in 1500
milliseconds.
2006-03-07 19:38:31.368 DVB#0 Rec: WARNING - No data from card in 1750
milliseconds.
2006-03-07 19:38:31.629 DVB#0 Rec: WARNING - No data from card in 2000
milliseconds.
2006-03-07 19:38:31.888 DVB#0 Rec: WARNING - No data from card in 2250
milliseconds.
2006-03-07 19:38:32.148 DVB#0 Rec: WARNING - No data from card in 2500
milliseconds.
2006-03-07 19:38:32.408 DVB#0 Rec: WARNING - No data from card in 2750
milliseconds.
2006-03-07 19:38:32.668 DVB#0 Rec: WARNING - No data from card in 3000
milliseconds.
2006-03-07 19:38:32.928 DVB#0 Rec: WARNING - No data from card in 3250
milliseconds.
2006-03-07 19:38:33.188 DVB#0 Rec: WARNING - No data from card in 3500
milliseconds.
2006-03-07 19:38:33.448 DVB#0 Rec: WARNING - No data from card in 3750
milliseconds.
2006-03-07 19:38:33.708 DVB#0 Rec: WARNING - No data from card in 4000
milliseconds.
2006-03-07 19:38:33.968 DVB#0 Rec: WARNING - No data from card in 4250
milliseconds.
2006-03-07 19:38:34.122 DVB#0 Rec: WARNING - Got data from card.
2006-03-07 19:39:47.478 DVB#0 Rec: WARNING - No data from card in 250
milliseconds.
2006-03-07 19:39:47.738 DVB#0 Rec: WARNING - No data from card in 500
milliseconds.
2006-03-07 19:39:47.998 DVB#0 Rec: WARNING - No data from card in 750
milliseconds.
2006-03-07 19:39:48.258 DVB#0 Rec: WARNING - No data from card in 1000
milliseconds.
2006-03-07 19:39:48.518 DVB#0 Rec: WARNING - No data from card in 1250
milliseconds.
2006-03-07 19:39:48.778 DVB#0 Rec: WARNING - No data from card in 1500
milliseconds.
2006-03-07 19:39:49.038 DVB#0 Rec: WARNING - No data from card in 1750
milliseconds.
2006-03-07 19:39:49.298 DVB#0 Rec: WARNING - No data from card in 2000
milliseconds.
2006-03-07 19:39:49.558 DVB#0 Rec: WARNING - No data from card in 2250
milliseconds.
2006-03-07 19:39:49.818 DVB#0 Rec: WARNING - No data from card in 2500
milliseconds.
2006-03-07 19:39:50.078 DVB#0 Rec: WARNING - No data from card in 2750
milliseconds.
2006-03-07 19:39:50.338 DVB#0 Rec: WARNING - No data from card in 3000
milliseconds.
2006-03-07 19:39:50.598 DVB#0 Rec: WARNING - No data from card in 3250
milliseconds.
2006-03-07 19:39:50.858 DVB#0 Rec: WARNING - No data from card in 3500
milliseconds.
2006-03-07 19:39:51.118 DVB#0 Rec: WARNING - No data from card in 3750
milliseconds.
2006-03-07 19:39:51.378 DVB#0 Rec: WARNING - No data from card in 4000
milliseconds.
2006-03-07 19:39:51.638 DVB#0 Rec: WARNING - No data from card in 4250
milliseconds.
2006-03-07 19:39:51.787 DVB#0 Rec: WARNING - Got data from card.

this happens over and over, every min or so throughout any program I record.
Its always 4250 ms...

I have tried running top, and nothing seems to be caning the processor at
that stage.
I have swapped out the ram and the hard disk for known good items, and
restored my root partition from a known good backup from well before this
started happening.

I am perplexed :( does anyone have any insight as to what I should do next?
i am OK with Linux in general, so the more techie the better AFAIAC

I have 2 DVB cards, and it happens on both, but not at the same time. If i
deliberately pull the aerial while recording, I obviously get the message,
but for both cards at the same time (as expected). Ive also proved that this
can happen for more than 4250ms (FWIW).

The DVB signal strength table seems to contain no records - does anyone know
how I can enable this?


thanks

George
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