Hi,

On Saturday, 24 February 2007 10:55, Andrey Borzenkov wrote:

On Вторник 13 февраля 2007, Andrey Borzenkov wrote:

quoted

On Четверг 07 декабря 2006, Lebedev, Vladimir P wrote:

quoted

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.

First, if you want the reserved memory areas to be left alone by swsusp,
you need to mark them as 'nosave'.  On x86_64 this is done by the function
e820_mark_nosave_range() in arch/x86_64/kernel/e820.c that can be ported to
i386 with no problems.  However, we haven't found that very useful, so far,
since no one has ever reported any problems with the current approach,
which is to save and restore them.

Second, if you want to know if a suspicious page frame is saved by swsusp,
it's best to stick a test and a printk in kernel/power/pack_pfns() and
artificially fail the suspend, eg. by making swsusp_write() always return
an error.

Gratefully waiting for patches to test :)

Sorry, no patches this time.  I have more urgent problem to fix. :-)

Greetings,
Rafael

quoted

quoted

-----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:

quoted

Hi,

On Thursday, 7 December 2006 19:57, Karasyov, Konstantin A wrote:

quoted

Hi,

Unfortunately, I cannot reproduce this bug on my system, but the

problem

quoted

quoted

could be solved by adding a resume handler for AC adapter device.

Could

quoted

quoted

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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