linux-kernel - Re: [RFT][PATCH] swsusp: Change code ordering related to ACPI

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Date:	Sat, 5 May 2007 11:50:21 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Ray Lee" <ray-lk@...rabbit.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Marcus Better" <marcus@...ter.se>, "Pavel Machek" <pavel@....cz>,
	"Tobias Diedrich" <ranma+kernel@...edrich.de>,
	"pm list" <linux-pm@...ts.linux-foundation.org>
Subject: Re: [RFT][PATCH] swsusp: Change code ordering related to ACPI

On Saturday, 5 May 2007 01:11, Ray Lee wrote:
> On 5/4/07, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > The change of the hibernation/suspend code ordering made before 2.6.21 has
> > caused some systems to have problems related to ACPI.  In particular, the
> > 'platform' hibernation mode doesn't work any more on some systems.
> 
> It seems that somewhere between 2.6.21-rc4 and 2.6.21 final my laptop
> stopped being able to come out of suspend to RAM. Before I start
> bisecting (again, sigh), is this ringing any bells for anyone? In
> particular your, patch (snipped) that deals with hibernation, would it
> also affect suspend to RAM?

Not this particular one, but you may try to move pm_finish() after
resume_console() in kernel/power/main.c:suspend_prepare() and see if that
helps.

If it doesn't help, then try to compile the kernel with NO_HZ and
HIGH_RES_TIMERS unset.  If that doesn't help, you may try with HPET_TIMER
unset additionally.

Greetings,
Rafael 
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