Wolfgang Wershofen wrote:
calling dvbtune will open the frontend device and thus waking up the card. As soon dvbtune dies the filedescriptor will be closed and the frontend will get shutted down unless you explicitly disabled power management.Dienstag, 29. Oktober 2002 at 10:13 Holger Waechtler wrote:(...)The bad thing is that you explicitly have to disable power management for networking over DVB (or run an application all the time which processes frontend events;)
Does this mean, you'll have to tune the card new every time, the card is revived. Or the other way round: does tuning e.g. with dvbtune wake up the card?
In your case you want to disable power management by passing the dvb_shutdown_timeout=0 parameter.I run my budget-card only for sat-networking purposes in a router. At the moment I tune the card right after booting to the desired freq, set up the network interface and I'm done with that. If I were to use power management in that router (which I do not at the moment), would I have to tune the card every time, a connection to the internet is requested to make shure, the card is awake and has the right frequency?
What happens to the network-interface, when the card is powered down? Do I have to re-ifconfig this? This would add some additional seconds during connection, which is a disadvantage for dial-on-demand systems.
It won't get any data.
it's there, the parameter is called dvb_shutdown_timeout. When you pass a value of zero the frontend will always keep it's power.So I think, one has to decide between dial-on-demand and power management, when you apply the suggested changes. That's no problem for me but may be for others. Wouldn't it be possible to introduce some kind of driver option, with which the user can enable or disable power management according to his/her needs?
Holger
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