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

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Date:	Thu, 17 Sep 2009 14:24:51 +0200
From:	Norbert Preining <preining@...ic.at>
To:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Mattia Dongili <malattia@...ux.it>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Matthias Welwarsky <matze@...warsky.de>
Subject: Linux not shutting down all devices? Battery drain in after
 shutdown

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


Thanks a lot for any suggestions and ideas and help

Norbert

[1] http://forum.notebookreview.com/showthread.php?t=299109
[2] http://www.basyskom.org/~eva/log_installation_vaio_z21vnx.html
[3] http://www.logic.at/people/preining/software/sony-laptop-zseries-0.9-for-2.6.31.tar.gz
[4] Message-ID: <20090331152035.GA20946@...f.ucam.org>

-------------------------------------------------------------------------------
Dr. Norbert Preining <preining@...ic.at>        Vienna University of Technology
Debian Developer <preining@...ian.org>                         Debian TeX Group
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