[linux-dvb] need to hold fronend device open

Mike mike at obelix.homelinux.net
Tue Dec 4 11:14:04 CET 2007



Nico Sabbi schrieb:
> Il Tuesday 04 December 2007 08:10:26 Iilluzion Shadow ha scritto:
>   
>> Hi there!
>> I appreciated for good staff you develop.
>>
>> The question is:
>> is it a bug or feature that to be able to have dvbnet device
>> operational to be able to get traffic i need to have frontend
>> device to be held open by a user process?
>>
>> env:
>>   dvb card: TT-budget S-1401
>>   budget module from kernel 2.6.22
>>   linuxtv-dvb-apps-1.1.1
>>
>> OK. some examples.
>>
>> successful example 1
>> 1. szap -n 1    - successfully locks a signal and continually
>> monitors signal strength
>>   1.2 meanwhile [kdvb-fe-0] is being hold open
>> 2. dvbnet        - successfully makes a dvb0_0 device
>> 3. ifconfig       - successfully initializes dvb device
>> 4. tcpdump    - gives traffic
>>
>> unsuccessful example 2
>>
>> 1. szap -n 1 -x - lock a signal and stops
>> 2,3. dvbnet and ifconfig - make dvb0_0
>> 4. tcpdump - shows NO traffic
>>
>> reason:  [kdvb-fe-0] is not being hold open
>> workaround: keep szap going placing it into background with &.
>>    szap -n 1 > /dev/null 2>&1 &
>>
>> so it seems i have to keep [kdvb-fe-0] making szap running
>>
>>     
>
> if you want to keep the frontend open load dvb_core with the parameter
> dvb_shutdown_timeout=0
>
> _______________________________________________
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> linux-dvb at linuxtv.org
> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
>   

Is this module parameter still working in later releases ( e.g. current 
CVS version ) ? It seems it is not. The parameter ist still defined but 
not used anymore.         


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