linux-kernel - Re: [BUG] [linux-pm] Commit "Hibernation: Enter platform hibernation state in a consistent way)" makes my system to resume instantly from S4

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Date:	Sun, 28 Oct 2007 21:23:15 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Maxim Levitsky <maximlevitsky@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [BUG] [linux-pm] Commit "Hibernation: Enter platform hibernation state in a consistent way)" makes my system to resume instantly from S4

On Sunday, 28 October 2007 21:00, Maxim Levitsky wrote:
> On Saturday 27 October 2007 23:46:45 Rafael J. Wysocki wrote:
> > On Saturday, 27 October 2007 14:05, Maxim Levitsky wrote:
> > > Hi,
> > > 
> > > Recently I noticed that my system resumes just after suspend to disk.
> > > 
> > > I traced this to commit 9cd9a0058dd35268b24fa16795a92c800f4086d4.
> > > 
> > > Note:
> > > 
> > > This happens only if I enable WOL using /proc/acpi/wakeup
> > > (echo "ILAN" > /proc/acpi/wakeup)
> > 
> > What happens after a suspend to RAM?
> I do more testing tomorrow, but what I remember is that,
> I had no issues with suspend-to-ram.
> (And take into account the fact that _all_ wakeup devices were enabled always,
> the rc.local does that for me, and still I did quite a lot of suspends, but I
> got the immediate resume, only and always after suspend to disk.

Hm, can you please retest with the above commit applied, but with
device_suspend() in hibernation_platform_enter() replaced by device_shutdown()?

> > > and have 
> > > "ACPI-Hibernate-erroneously-disabled-Suspend-wakeup" applied, since otherwise
> > > all wake-up sources are disabled in S4.
> > > 
> > > 
> > > Clearly the above commit confuses the BIOS.
> > > Using latest -git with the above patch reverted makes everything work again fine.
> > 
> > Well, this patch is needed to make wakeup from peripherals (eg. RTC alarm) work
> > on some boxes.
> > 
> > The symptom that you describe is similar to what I'm observing after a suspend
> > to RAM on one test box.
> > 
> > Can you produce a log of kernel messages printed before powering off the
> > system?
> How :-)
> 
> (I will try to set up netconsole, and turn on acpi debugging, maybe this will help)

Yes, I meant something like this.

Greetings,
Rafael
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