From: David Brownell <david-b@pacbell.net>
To: ncunningham@linuxmail.org
Cc: Paul Mackerras <paulus@samba.org>,
Linus Torvalds <torvalds@osdl.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>, Pavel Machek <pavel@ucw.cz>
Subject: Re: Totally broken PCI PM calls
Date: Mon, 11 Oct 2004 14:37:17 -0700 [thread overview]
Message-ID: <200410111437.17898.david-b@pacbell.net> (raw)
In-Reply-To: <1097529469.4523.3.camel@desktop.cunninghams>
Hi Nigel,
On Monday 11 October 2004 2:17 pm, Nigel Cunningham wrote:
> On Tue, 2004-10-12 at 02:36, David Brownell wrote:
> > I've made that point too. STD is logically a few steps: quiesce system,
> > write image to swap, change power state.
I'm hoping you agree with that abbreviated summary of
what's involved! Pavel seemed to. Of course the devil is
in the details, which I hope to leave mostly to others ... ;)
> > The ACPI spec talks about
> > that as keeping the system in a G1/S4 powered state, but "swusp"
> > doesn't use that ... it does a full power-off. And of course,
> > full power-off
> > means that the BIOS probably mucks with the USB hardware, so it's
> > not a real resume any more.
>
> That's not necessarily true. Swsusp and suspend2 both include support
> for enter ACPI S4 state. For suspend2 it's optional (to allow for broken
> bioses). Not sure about whether it is with swsusp.
The machines I've tested with relatively generic 2.6.9-rc kernels
don't use BIOS support for S4 when I call swsusp.
Of course the ACPI spec muddies the water by talking about two
different states called "S4": "S4 Sleeping", which is what I was
talking about as G1/S4; and "S4 Non-Volatile Sleep" that's more
what I've seen with swusp: more like a G2 or G3 poweroff.
I'm willing to believe that there are systems on which swsusp
tells drivers a less confusing story ... but I don't seem to have
tested with those!
- Dave
next prev parent reply other threads:[~2004-10-11 21:37 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-11 0:45 Totally broken PCI PM calls Benjamin Herrenschmidt
2004-10-11 2:41 ` Linus Torvalds
2004-10-11 3:42 ` Paul Mackerras
2004-10-11 4:04 ` Linus Torvalds
2004-10-11 4:24 ` Paul Mackerras
2004-10-11 9:57 ` Pavel Machek
2004-10-11 14:42 ` Linus Torvalds
2004-10-11 14:56 ` suspend-to-RAM [was Re: Totally broken PCI PM calls] Pavel Machek
2004-10-11 15:30 ` Linus Torvalds
2004-10-11 17:39 ` Olivier Galibert
2004-10-11 18:21 ` Pavel Machek
2004-10-11 15:53 ` Brice Goglin
2004-10-11 16:17 ` Pavel Machek
2004-10-11 17:09 ` Brice Goglin
2004-10-11 18:23 ` Pavel Machek
2004-10-11 18:40 ` Brice Goglin
2004-10-11 16:47 ` Totally broken PCI PM calls David Brownell
2004-10-11 22:28 ` Benjamin Herrenschmidt
2004-10-11 22:58 ` Dmitry Torokhov
2004-10-11 23:08 ` Benjamin Herrenschmidt
2004-10-12 3:00 ` David Brownell
2004-10-12 4:09 ` Dmitry Torokhov
2004-10-12 16:56 ` David Brownell
2004-10-12 9:27 ` Russell King
2004-10-12 11:24 ` Benjamin Herrenschmidt
2004-10-11 4:25 ` Linus Torvalds
2004-10-11 10:18 ` Pavel Machek
2004-10-11 10:54 ` Benjamin Herrenschmidt
2004-10-11 16:01 ` Linus Torvalds
2004-10-15 13:59 ` Pavel Machek
2004-10-15 15:56 ` Linus Torvalds
2004-10-24 20:58 ` Pavel Machek
2004-10-24 21:18 ` Linus Torvalds
2004-10-11 16:36 ` David Brownell
2004-10-11 21:17 ` Nigel Cunningham
2004-10-11 21:37 ` David Brownell [this message]
2004-10-11 22:12 ` Stefan Seyfried
2004-10-12 2:59 ` David Brownell
2004-10-12 8:54 ` Pavel Machek
2004-10-12 10:32 ` Stefan Seyfried
2004-10-12 18:28 ` David Brownell
2004-10-12 20:28 ` Stefan Seyfried
2004-10-13 13:34 ` David Brownell
2004-10-12 1:24 ` Nigel Cunningham
2004-10-12 8:53 ` Pavel Machek
2004-10-12 18:52 ` David Brownell
2004-10-12 19:50 ` Pavel Machek
2004-10-12 22:13 ` Benjamin Herrenschmidt
2004-10-12 22:35 ` David Brownell
2004-10-11 22:26 ` Benjamin Herrenschmidt
2004-10-11 3:45 ` Benjamin Herrenschmidt
2004-10-11 4:08 ` Linus Torvalds
2004-10-11 4:23 ` Benjamin Herrenschmidt
2004-10-11 4:32 ` Linus Torvalds
2004-10-11 4:55 ` Benjamin Herrenschmidt
2004-10-11 16:15 ` David Brownell
2004-10-11 22:22 ` Benjamin Herrenschmidt
2004-10-12 2:46 ` David Brownell
2004-10-12 4:02 ` Benjamin Herrenschmidt
2004-10-12 10:49 ` Nigel Cunningham
2004-10-12 11:27 ` Benjamin Herrenschmidt
2004-10-12 11:38 ` Nigel Cunningham
2004-10-12 11:51 ` Pavel Machek
2004-10-11 10:08 ` Pavel Machek
2004-10-11 9:51 ` Pavel Machek
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