Re: [RFD] Automatic suspend

mark gross
2009-02-17T21:57:17Z

On Mon, Feb 16, 2009 at 11:13:24PM +0000, Matthew Garrett wrote:
> On Mon, Feb 16, 2009 at 11:58:31PM +0100, Pavel Machek wrote:
>
> > If no devices are being used, and next wakeup is far enough in the
> > future, just put system to sleep. Long enough == so far away that
> > suspend/wakeup is short compared to that... like 20 seconds on PC.
>
> This is intrinsically difficult with PCs, since we have such a poorly
> defined set of wakeup events. We can't wakeup on generic network
> traffic, just WoL. Many machines won't wake up on keyboard events.
> Meanwhile, on embedded it's becoming a less interesting problem because
> idle and suspended are often now equivalent states. Concentrating on
> runtime PM of as much hardware as possible is arguably more interesting
> for the majority of use cases.

Putting the wake on key event issue aside, is it possible to have wake
up's on the ms time scale? I ask because I thought the XO did exactly
this (but left the screen live). Why does it take 20 sec to get into
or out of S3 on my laptop?

--mgross

>
> --
> Matthew Garrett | mjg59@srcf.ucam.org