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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Message-Id: <200710290845.11016.maximlevitsky@gmail.com>
Date:	Mon, 29 Oct 2007 08:45:10 +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 Sunday 28 October 2007 22:23:15 Rafael J. Wysocki wrote:
> 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()?
Bingo! doing the above fixes this problem.
And... strange, since I did test the system with e1000 unloaded, but still got same bug,
back when I chased that bug, thus it is probably not related to e1000 and WOL.

the ACPI wake-up source (I have read the DSDT, and ICH datasheets, thus I know that this is a set of bits in southbridge)
of e1000 is shared with EHCI and HDA sound codec.
(But usb on my system only able to wake from S3, and the soundchip which can theoretically wake up from S3 too, doesn't have this ability)

(But disabling this wakeup source, fixes this bug too)

Thanks,
	Best regards,
		Maxim Levitsky
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