[linux-dvb] FlyDVB-T Hybrid - tuning and parameter drift?

Hartmut Hackmann hartmut.hackmann at t-online.de
Mon Nov 13 00:48:13 CET 2006


Hi, Mark

Mark Edwards wrote:
> I looked at the pci card just now, and it's down the other end of the 
> motherboard from the graphics card. I'm not sure if I will be able to do 
> much more to get the temperature down but will try.
>  
> Another thing that intriegues me is that the card comes back online with 
> a reset of the driver modules, although this will have no effect on the 
> temperature things work fine again for a period of time. Is there 
> possibly something else that we are missing here? Very happy to assist 
> with debugging this issue - know my way around C code but I would have 
> to admit to being a bit of a rookie when it comes to driver level stuff...
>  
> Mark.
> 
>  
> On 11/12/06, *Mark Edwards* <mark.p.edwards at gmail.com 
> <mailto:mark.p.edwards at gmail.com>> wrote:
> 
>     Thanks mate - I will try this. It's interesting that it might be a
>     temperature problem, as I am also experiencing a similar type of
>     drift with my graphics card. After a few hours use, the TV-out
>     (Svideo) loses sync and the pictures starts to roll. I can fix it by
>     changing to a text console and then back again to X windows (with
>     MythTV).
>      
>     I'll try changing the PCI slot and move it further away from the
>     graphics card.
>      
>     cheers,
>      
>     Mark
> 
>      
>     On 11/11/06, *Hartmut Hackmann* <hartmut.hackmann at t-online.de
>     <mailto:hartmut.hackmann at t-online.de>> wrote:
> 
>         Hi, Mark
> 
>         Mark Edwards wrote:
>>  Hi gentle DVB folk.
>>
>>  I have a flyvideo hybrid DVB card in my shiny new linux box.
>>
>>  It shows up thus in lspci...
>>
>>  05:00.0 Multimedia controller: Philips Semiconductors
>         SAA7133/SAA7135
>>  Video Broadcast Decoder (rev d0)
>>         Subsystem: Animation Technologies Inc.: Unknown device
>         3306
>>         Flags: bus master, medium devsel, latency 32, IRQ 217
>>         Memory at f9100000 (32-bit, non-prefetchable) [size=2K]
>>         Capabilities: <available only to root>
>>
>>
>>  modules loaded are:
>>
>>  saa7134_dvb, dvb_pll, saa7134, tda1004x
>>
>>  I am experiencing what I can only describe as 'parameter
>         drift' on the
>>  card. I tune up the card nicely and watch TV for a while.
>         Machine gets
>>  left on. By the next day, the card is unable to achieve tuning
>         lock. I
>>  unload and reload the modules, and hey presto - we're working
>         again.
>>
>>  This problem shows up when using DVB. I havn't tried FM radio or
>>  Analogue TV.
>>
>>  Any ideas what might be going on here?
>>
>>  cheers,
>>
>>  Mark.
>>
>>  --
>>  regards,
>>
>>  Mark P. Edwards
>>
>>
>>
>         ------------------------------------------------------------------------
> 
>>
>         This can be a temperature problem. The first generation of the
>         tuners on
>         this card has an enormous power consumption. How old is the
>         driver you are
>         using?
>         In the last months, i changed the driver to:
>         - put unused components to standby mode
>         - make the dvb-t channel decoder more tolerant to xtal frequency
>         offsets.
>         so can you please get a recent driver from www.linuxtv.org
>         <http://www.linuxtv.org/> and retry?
>         If you have a recent driver can you try to ensure that there is some
>         air flow around the card (i.e. by freeing the PCI slots close to
>         it)?
> 
>         Best regards
>            Hartmut
> 
> 
> 
> 
>     -- 
>     regards,
> 
>     Mark P. Edwards 
> 

You are right of corse with the reset. Though the reason might be that
the DSP of the channel decoder has cashed. If you try to tune dvb after
the card has broken down, are there any "strange" messages in the kernel
log?

Hartmut






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