Re: [RFD] Automatic suspend

Pavel Machek
2009-02-20T18:05:53Z

On Tue 2009-02-17 00:20:12, Oliver Neukum wrote:
> Am Monday 16 February 2009 18:31:08 schrieb Arjan van de Ven:
> > On Mon, 16 Feb 2009 17:48:06 +0100
> > Oliver Neukum <oliver@neukum.org> wrote:
> >
> > > > Userspace should just be the part that says "I'm interested in link
> > > > notifications". The driver then just goes to the lowest power state
> > > > for its device that still gives those notifications.
> > >
> > > Should there be a channel through which drivers can tell user space
> > > what the consequences in terms of reaching a sleep state are if a
> > > service is requested?
> >
> > Personally, I don't think so.
> > Think about it: what would userspace do?
> > Not ask for the functionality if it means no sleep state?
> > Maybe it should just never ask for it then as a required functionality!
>
> 1. You may have a human being using the information to make the tradeoff.
> 2. User space may be able to select among several devices the one cheapest
> to use

Well, that sounds complex/fragile... and it is really exporting
hardware impormation driver does not even neccessarily know.

If this is for user, perhaps it should be in documentation and/or
hardware user manual?

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