linux-kernel - Re: 2.6.21-mm2: ACPI exception on resume

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Message-ID: <20070523211517.GK11115@waste.org>
Date:	Wed, 23 May 2007 16:15:17 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: 2.6.21-mm2: ACPI exception on resume

On Wed, May 23, 2007 at 10:56:27PM +0200, Rafael J. Wysocki wrote:
> On Wednesday, 23 May 2007 19:48, Matt Mackall wrote:
> > On Wed, May 23, 2007 at 02:13:30PM -0300, Henrique de Moraes Holschuh wrote:
> > > On Wed, 23 May 2007, Rafael J. Wysocki wrote:
> > > > While I agree with that, it would really be helpful if you tested the latest -rc
> > > > kernel and saw if the bug was present in there.
> > > > 
> > > > If the bug is not present in the latest -rc, it'll be possible to identify the
> > > > patch that causes it to appear in -mm and find the reason of the breakage.
> > > 
> > > And, once we know the reason, we will be able to find out how to best fix the
> > > problem.
> > > 
> > > So, do please test latest -rc, or bissect to the last known-good kernel. As
> > > I said, we need further data points to do anything.
> > 
> > This isn't conclusive as this bug is fairly hard to trigger, but it
> > looks like the culprit may have been this patch and not anything in
> > -mm or mainline. So the below patch doesn't help the problem it was
> > intended for (lid switch no longer wakes up S2R after a S2D cycle) and
> > appears to be implicated in making my EC unhappy.
> 
> Yes, this was just a debug patch.
> 
> We broke quite a few systems by placing platform_finish() before
> device_resume() and I suspected your system could be one of them.
> 
> Apparently, that's not the case.
> 
> In 2.6.22-rc2 we also moved platform_prepare() to after device_suspend()
> and that's why I asked you to test this kernel.

Will get to it eventually.

-- 
Mathematics is the supreme nostalgia of our time.
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