Re: [Bdadev-discuss] BDA and Power Management

[Colin D. M. <li...@mi...>]

Quoting Robert Schlabbach <rob...@gm...>:

> BTW, Colin, while I got you on the list: It appears your driver has no
> support for power management (just like mine:(). Have you looked into this,
> or do you know of a good resource? I tried reading the DDK documentation,
> but it only left me confused :(
> 

I've not really looked at the power management stuff, and since I just 
recently upgraded to Windows XP I've not reinstalled the DDK yet (although I 
will soon).

> The key thing one has to do is to restore the hardware state after resuming
> e.g. from hibernating (i.e. complete power-off). Now the ugly thing about
> this is that if a BDA graph is running when you hibernate, it will only be
> put in _paused_ state, not stopped! Thus, you need to get the hardware back
> exactly to that paused state, which I think is rather complicated... Or
> maybe there is a way to request that the graph is put in stopped state? I
> haven't found any, though :(

I suppose if you stored the state of what you were told to do you could re-set 
the parameters of the card when you were awoken so the graph wouldn't realise 
anything had changed, but that could be tricky to make work, it seems a bit 
annoying that it only pauses. I'll have a look once I've re-installed the DDK 
to see if I can spot anything but I'm not sure if it's just going to have to 
be done a difficult way or such.

Sorry I couldn't be of more help,
Colin