From: Lee Revell <rlrevell@joe-job•com>
To: Guennadi Liakhovetski <g.liakhovetski@gmx•de>
Cc: linuxppc-embedded@ozlabs•org
Subject: Re: sleep / wake-up
Date: Sat, 10 Jun 2006 19:02:10 -0400 [thread overview]
Message-ID: <1149980531.14253.92.camel@mindpipe> (raw)
In-Reply-To: <Pine.LNX.4.60.0606110027010.16586@poirot.grange>
On Sun, 2006-06-11 at 00:41 +0200, Guennadi Liakhovetski wrote:
> On Sat, 10 Jun 2006, Jon Scully wrote:
>
> > Also, here's an article (just about 4 days old):
> > http://www.linux.com/article.pl?sid=06/05/24/1716222
> > (I thought the subject sounded familiar ;-)
>
> Ok, thanks for both replies. That's a good start already! But this is all
> about __software__ suspend. But aren't some other "hardware" suspend-modes
> also available on ppc, like suspend-to-RAM? For example, on my system I
> could say quite a bit of power by stopping the HD, switching off
> USB-ports, eth, and then putting the CPU to sleep? Would all this be
> doable by just performing those steps and then clocking the CPU down?
>
Did you read the article?
"ACPI state S3 -- also know as Suspend-to-RAM -- is the state where
everything in the system enters a low-power state except for RAM, which
consumes a small amount of power in order to retain its contents, so
that upon resuming, everything is loaded back from the memory and all
running applications are restored immediately."
> I must admit, I don't understand the whole idea behind suspending at all.
> What happens to all applications that went to sleep for 1 second and wake
> up 2 days later? What about all network connections? timeouts? I have to
> read some basics...
It's insanely difficult and complicated. Every single driver and kernel
subsystem has to be changed. Zillions of man-hours have gone into
getting suspend to work on Linux and it's still not there...
Lee
next prev parent reply other threads:[~2006-06-10 23:08 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-10 18:39 sleep / wake-up Guennadi Liakhovetski
2006-06-10 22:03 ` Jon Scully
2006-06-10 22:41 ` Guennadi Liakhovetski
2006-06-10 23:02 ` Lee Revell [this message]
2006-06-10 23:38 ` Guennadi Liakhovetski
2006-06-11 0:05 ` Lee Revell
2006-06-11 10:57 ` Guennadi Liakhovetski
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