[linux-dvb] Lost lock problems over extended periods of time

Manu Abraham manu at kromtek.com
Tue Jun 7 18:54:30 CEST 2005


Andrew de Quincey wrote:
>>>>The periods used to vary, don't know what exactly caused them to vary
>>>>either. The variations used to happen something like what you said 10 ~
>>>>12 hours or sometime it was 48 hours. But 72 hours seemed the maximum
>>>>that it would go many times.
>>>Interesting - thats exactly it.. so its across completely different card
>>>architectures!? (I assume you're still talking about the twinhan cards
>>>here)
>>Exactly.. I am talking about different firmware based ones too FTA and
>>CI based.. different generations too.. Regarding that issue i' am almost
>>tied up in knots... :-(
>>
>>I had a revision AV7110 1.3 card, which was blown when i received itself
>>from Galaxis as a sample given to one of our guys. Even an lspci did not
>>show anything at all, on some motherboards inserting the card into the
>>PCI slot itself would result in a hung BIOS. After that i decided that,
>>i would never again go with one of those FF cards. (eventhough they are
>>the same TT-PCI cards remarketed)
>>
>>That was the time i first started up with DVB, and in this region could
>>not see any other hardware other than Twinhan and got my first card as
>>well as suggested for many others as well as my company too. But the
>>biggest problem their was drivers, whether be it Windows or Linux. well
>>you know the rest..
> 
> OK, my hack doesn't help. I used the following patch in dvb_frontend.c:
> Index: dvb_frontend.c
> ===================================================================
> RCS 
> file: /cvs/linuxtv/dvb-kernel/linux/drivers/media/dvb/dvb-core/dvb_frontend.c,v
> retrieving revision 1.96
> diff -a -u -r1.96 dvb_frontend.c
> --- dvb_frontend.c      17 Nov 2004 14:30:33 -0000      1.96
> +++ dvb_frontend.c      7 Jun 2005 16:29:35 -0000
> @@ -507,9 +507,10 @@
>                         else {
>                                 /* if we _WERE_ tuned, but now don't have a 
> lock,
>                                  * need to zigzag */
> -                               fe->state = FESTATE_ZIGZAG_FAST;
> -                               fe->started_auto_step = fe->auto_step;
> -                               check_wrapped = 0;
> +                               fe->state = FESTATE_RETUNE;
> +                               dvb_frontend_init (fe);
> +                               printk("DVB: LOST LOCK - attempting 
> retune\n");
> +                          continue;
>                         }
>                 }
> 
> But, it just sits there printing "DVB LOST LOCK". Of course when I retune it 
> works perfectly! This time, it only took about 30 mins to lose the lock 
> though.
> 

That sounds a bit weird..

I can only try it out a few days later .. :-(

Manu






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