linux-kernel - Re: 2.6.21-rc5-mm2 -- ACPI problems (lid switch broken, always shows running from AC, plugging in AC hangs machine)

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Date:	Thu, 29 Mar 2007 13:11:09 -0400
From:	Len Brown <lenb@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Miles Lane" <miles.lane@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org
Subject: Re: 2.6.21-rc5-mm2 -- ACPI problems (lid switch broken, always shows running from AC, plugging in AC hangs machine)

On Thursday 29 March 2007 04:15, Andrew Morton wrote:
> On Thu, 29 Mar 2007 01:00:45 -0700 "Miles Lane" <miles.lane@...il.com> wrote:
> 
> > On 3/28/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> > > On Wed, 28 Mar 2007 13:55:54 -0700
> > > "Miles Lane" <miles.lane@...il.com> wrote:
> > >
> > > > My laptop (HP dv1240us) is always showing that my laptop is plugged
> > > > into AC power, even when it is running off of the battery.  When I
> > > > plug into the AC after running on the battery, the machine immediately
> > > > locks up.  Also, the laptop lid button isn't working -- pressing it
> > > > doesn't trigger a suspend.
> > >
> > > OK, thanks.
> > >
> > > If you have time, could you please test
> > >
> > > 2.6.21-rc5 +
> > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.21-rc5/2.6.21-rc5-mm2/broken-out/origin.patch + ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.21-rc5/2.6.21-rc5-mm2/broken-out/git-acpi.patch
> > > which will allow us to eliminate any non-acpi patches.
> > 
> > Okay, I tested with those patches and got the same problems with the
> > resulting build.
> > I can't reproduce the hang on plugging in the AC with either
> > 2.6.21-rc5-mm2 or the
> > build with the patches you sent.

So it sounds like the most serious problem, the hang,
is not reproducible without the reset of the -mm tree.

> > The other problems are 100% reproducible. 
> > I have some new details:
> > 
> > 1.  Power always shows up as plugged in to AC.
> > 2.  The lid button is non-operational for initiating a suspend.
> > 3.  Suspending from the Gnome shutdown menu works.   Afterwards, the
> > lid button works for resuming from suspend.
> > 4.  If I suspend, resume and then try to shutdown; when I see the
> > message "The machine will now halt" the power does not shut off.  That
> > is, the various buttons on my laptop stay lit up.  I am forced to
> > shutdown by holding down the power button for five seconds.
> > 
> 
> Thanks.  So we can conclude that all these problems are due to changes in
> 2.6.21-rc5-mm2's git-acpi.patch?

Miles,

Please apply the latest acpi patch directly on top of Linus' tree.
http://ftp.kernel.org/pub/linux/kernel/people/lenb/acpi/patches/test/2.6.21/acpi-test-20070126-2.6.21-rc5.diff.gz
If Andrew and I are in sync, you should get the same issues above as above -- no hang,
but still problems 1-4.

Then revert that patch and edit it to delete all changes to ec.c
and apply it again.  ie. keep drivers/acpi/ec.c from Linus's tree and re-test.
If the symptoms 1-4 go away, then we've isolated the regression to the changes to ec.c.

Also, it might be helpful to open up a bug report here:
http://bugzilla.kernel.org/enter_bug.cgi?product=ACPI
and attach to it the output from acpidump

thanks,
-Len
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