linux-kernel - Re: [Suspend-devel] 2.6.25-rc2 System no longer powers off aftersuspend-to-disk. Screen becomes green.

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Message-Id: <200802211713.20713.jesse.barnes@intel.com>
Date:	Thu, 21 Feb 2008 17:13:20 -0800
From:	Jesse Barnes <jesse.barnes@...el.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jeff Chua <jeff.chua.linux@...il.com>,
	Romano Giannetti <romano@....icai.upcomillas.es>,
	suspend-devel List <suspend-devel@...ts.sourceforge.net>,
	Dave Airlie <airlied@...ux.ie>, Greg KH <gregkh@...e.de>,
	lkml <linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org
Subject: Re: [Suspend-devel] 2.6.25-rc2 System no longer powers off aftersuspend-to-disk. Screen becomes green.

On Thursday, February 21, 2008 4:54 pm Rafael J. Wysocki wrote:
> On Friday, 22 of February 2008, Linus Torvalds wrote:
> > On Fri, 22 Feb 2008, Rafael J. Wysocki wrote:
> > > -	if (state.event == PM_EVENT_SUSPEND) {
> > > +	if (state.event == PM_EVENT_SUSPEND && !in_hibernation_power_off()) {
> >
> > I don't understand why hibernation just doesn't use a PM_EVENT_HIBERNATE,
> > and be done with it?
> >
> > Why should it be called PM_EVENT_SUSPEND when it isn't?
> >
> > Adding some external global variables is absolutely the wrong way to fix
> > this.
> >
> > It's not even like there are very many drivers who actually care about
> > "state.event" anyway: a 'git grep' returns just 35 users in the whole
> > tree, so if this was done this ugly way just to avoid double-chcking the
> > other cases that compare against PM_EVENT_SUSPEND, then it really wasn't
> > worth it.
>
> Please relax, we're debugging the thing right now and the patch doesn't
> even seem to help on the other affected box.

Actually, looks like I forgot to reboot between tests (just rmmod'd & 
modprobed i915), your patch actually does work.

However, making new PM event messages might be a good thing anyway, assuming 
Linus takes it for 2.6.25, since it should make the migration to ->hibernate 
callbacks easier.

Jesse
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