Re: 2.6.19: ACPI reports AC not present after resume from STD

From: Andrey Borzenkov <arvidjaar@mail.ru>
To: "Lebedev, Vladimir P" <vladimir.p.lebedev@intel.com>
Cc: linux-acpi@vger.kernel.org, linux-pm@lists.osdl.org,
	linux-kernel@vger.kernel.org
Subject: Re: 2.6.19: ACPI reports AC not present after resume from STD
Date: Sat, 24 Feb 2007 12:55:01 +0300	[thread overview]
Message-ID: <200702241255.02073.arvidjaar@mail.ru> (raw)
In-Reply-To: <200702132116.05404.arvidjaar@mail.ru>

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On Вторник 13 февраля 2007, Andrey Borzenkov wrote:
> On Четверг 07 декабря 2006, Lebedev, Vladimir P wrote:
> > Please register new bug, attach acpidump and dmesg.
>
> http://bugzilla.kernel.org/show_bug.cgi?id=7995
>
> regards
>

Well, this starts looking like ACPI is not at fault.

When reporting AC state ACPI just reads contents of system memory (I presume 
it gets updated by BIOS/ACPI when AC state changes). It looks like this 
memory area is restored during resume from STD. I updated mentioned bug 
report with more detailed description. Now if someone could suggest a way to 
catch if specific physical address gets saved/restored this would finally 
explain it.

Gratefully waiting for patches to test :)

- -andrey

> > -----Original Message-----
> > From: Alexey Starikovskiy [mailto:alexey.y.starikovskiy@linux.intel.com]
> >
> > Sent: Thursday, December 07, 2006 10:49 PM
> > To: Rafael J. Wysocki
> > Cc: Karasyov, Konstantin A; Andrey Borzenkov;
> > linux-acpi@vger.kernel.org; Lebedev, Vladimir P
> > Subject: Re: 2.6.19: ACPI reports AC not present after resume from STD
> >
> > Rafael J. Wysocki wrote:
> > > Hi,
> > >
> > > On Thursday, 7 December 2006 19:57, Karasyov, Konstantin A wrote:
> > >> Hi,
> > >>
> > >> Unfortunately, I cannot reproduce this bug on my system, but the
> >
> > problem
> >
> > >> could be solved by adding a resume handler for AC adapter device.
> >
> > Could
> >
> > >> you try the attached patch to see if it helps.
> > >
> > > I can reproduce it and the patch doesn't help.
> > >
> > > Greetings,
> > > Rafael
> >
> > Any ACPI errors in dmesg?
> >
> > Regards,
> >     Alex.

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