[linux-dvb] Re: [POLL] kdvb-fe, tune at initialisation, power management

[Mike Grant <mgg@ecs.soton.ac.uk>]

Holger Waechtler wrote:

> I'd like to disable tuning at driver initialisation (saves about 50
> lines of code) and enable power management by default in the frontend
> code (causes kdvb-fe not to run when frontend device is not opened).

This sounds like a good thing to me - hopefully, it'd save me 35% or 
idle CPU use (in the kdvb-fe thread) on my untunable DVB-S, which has no 
dish connected and is just for TV output.  Not to mention a lot of heat :)

> The good thing is that the frontend thread won't run when no 
> application requested tuning to a transponder <snip>

One quick question though - will this change mean that the kdvb-fe 
zigzag scan will only run if the card is tuned, or that it will run if 
the frontend device is opened, even if no tuning is attempted?

I think, although I've not checked properly, that VDR opens the frontend 
device, even if the card is only for TV output.  With the suggested 
patch, I presume that an open frontend device will be required for TV 
output anyway.

Ideally, it'd be nice if the zigzag scan only runs if a tuning is 
attempted.  That may be for a later patch though :)

Some background on my problem which gives rise to this question: 
http://www.linuxtv.org/mailinglists/linux-dvb/2002/10-2002/msg00581.html

Cheers,

Mike Grant.



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