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 22:00:53 +0200
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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 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.

> 
> > 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)
> 
> Greetings,
> Rafael
> 

Thanks,
	Best regards,
		Maxim Levitsky
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