linux-kernel - Re: Linux not shutting down all devices? Battery drain in after shutdown

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Message-ID: <20090919103709.GA4466@elf.ucw.cz>
Date:	Sat, 19 Sep 2009 12:37:09 +0200
From:	Pavel Machek <pavel@....cz>
To:	Norbert Preining <preining@...ic.at>
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Mattia Dongili <malattia@...ux.it>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Matthias Welwarsky <matze@...warsky.de>
Subject: Re: Linux not shutting down all devices? Battery drain in after
	shutdown

On Thu 2009-09-17 14:24:51, Norbert Preining wrote:
> Dear all,
> 
> I have a very strange problem with my Sony VAIO Z11 laptop. When I turn
> it off in Linux it still drains battery, and quite a lot indeed, several
> percent per hour.
> 
> Interestingly, when shutting down from Windows XP the same doesn't happen,
> after 10 hours of off time starting from 100% charge after rebooting I have
> still 98.8%, so that is fine (counting that booting costs some energy).
> 
> This is in fact also a problem for many other users using Windows, too,
> see [1]. I have checked that on Windows all devices are set up so that
> at shutdown and hibernation (S4 and S5) they are going to off state (D3).
> 
> The only thing I can imagine is that one of the devices not completely
> of not at all supported by the kernel is not properly shut down.
> AFAIS the only device which I have not running here is the fingerprint
> scanner.
> 
> My questions are:
> - is there a way and if how to check that all devices will get properly
>   shut down on halt?
> - is there any other reason the battery drain might happen?
> 
> Some details about the laptop:
> - it has a dual graphic card (Intel and nVidia), the sony-laptop module
>   (extended for the zseries, see [2], with adaption to 2.6.31 by me [3]), 
>   or the stock kernel sony-laptop plus the nvidia-control module 
>   (by Matthew Garret [4]) can be used to turn the nvidia card of on a
>   running system so that it does not draw any energy
> - lspci -vvv output is attached as lspci.txt
> - software running is Debian/sid with kernel 2.6.31

On PC, keyboard driver is expected to shut down the machine; I'd try
complaining to Sony, perhaps they have newer bios.


-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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