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Bug#356946: linux-image-2.6.15-1-686: the power off button does not work anymore

Package: linux-image-2.6.15-1-686
Version: 2.6.15-8
Severity: normal

Hello,

I can't use the power off button of my laptop to start the power off
sequence. I recompiled a vanilla kernel linux-2.6.15.6 (from kernel.org)
and the button works (without changing anything in user space) so the
bug seems to be Debian specific.

The button kernel module is loaded and the files are created in
/proc/acpi
$ find /proc/acpi/button/
/proc/acpi/button/
/proc/acpi/button/lid
/proc/acpi/button/lid/LID
/proc/acpi/button/lid/LID/state
/proc/acpi/button/lid/LID/info
/proc/acpi/button/sleep
/proc/acpi/button/power
/proc/acpi/button/power/PWBN
/proc/acpi/button/power/PWBN/info
/proc/acpi/button/power/PWRF
/proc/acpi/button/power/PWRF/info

but pressing the button has no effect.

$ cat /proc/acpi/button/power/PWBN/info
type:                    Power Button (CM)
$  cat /proc/acpi/button/power/PWRF/info
type:                    Power Button (FF)

I just tried with linux-image-2.6.14-2-686 (2.6.14-6bpo1 from
backports.org) and the power off button works. The button also worked
with previous official Debian kernels. I don't know exactly when it
stopped working.

I am using etch.

What can I do to help the debug?

Thanks

-- System Information:
Debian Release: testing/unstable
  APT prefers testing
  APT policy: (500, 'testing'), (90, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.15-1-686
Locale: LANG=fr_FR, LC_CTYPE=fr_FR (charmap=ISO-8859-1)

Versions of packages linux-image-2.6.15-1-686 depends on:
ii  module-init-tools             3.2.2-2    tools for managing Linux kernel mo
ii  yaird [linux-initramfs-tool]  0.0.12-3   Yet Another mkInitRD

Versions of packages linux-image-2.6.15-1-686 recommends:
ii  libc6-i686                    2.3.5-13   GNU C Library: Shared libraries [i

-- debconf information:
  linux-image-2.6.15-1-686/postinst/kimage-is-a-directory:
* linux-image-2.6.15-1-686/preinst/overwriting-modules-2.6.15-1-686: false
  linux-image-2.6.15-1-686/postinst/depmod-error-initrd-2.6.15-1-686: false
  linux-image-2.6.15-1-686/postinst/bootloader-error-2.6.15-1-686:
  linux-image-2.6.15-1-686/postinst/bootloader-test-error-2.6.15-1-686:
  linux-image-2.6.15-1-686/preinst/lilo-has-ramdisk:
  linux-image-2.6.15-1-686/preinst/failed-to-move-modules-2.6.15-1-686:
  linux-image-2.6.15-1-686/postinst/old-system-map-link-2.6.15-1-686: true
  linux-image-2.6.15-1-686/preinst/abort-install-2.6.15-1-686:
  linux-image-2.6.15-1-686/preinst/abort-overwrite-2.6.15-1-686:
  linux-image-2.6.15-1-686/preinst/bootloader-initrd-2.6.15-1-686: true
  linux-image-2.6.15-1-686/prerm/would-invalidate-boot-loader-2.6.15-1-686: true
  linux-image-2.6.15-1-686/preinst/lilo-initrd-2.6.15-1-686: true
  linux-image-2.6.15-1-686/postinst/old-initrd-link-2.6.15-1-686: true
  linux-image-2.6.15-1-686/postinst/old-dir-initrd-link-2.6.15-1-686: true
* linux-image-2.6.15-1-686/preinst/already-running-this-2.6.15-1-686:
  linux-image-2.6.15-1-686/preinst/initrd-2.6.15-1-686:
  linux-image-2.6.15-1-686/postinst/depmod-error-2.6.15-1-686: false
  linux-image-2.6.15-1-686/postinst/create-kimage-link-2.6.15-1-686: true
  linux-image-2.6.15-1-686/prerm/removing-running-kernel-2.6.15-1-686: true
  linux-image-2.6.15-1-686/preinst/elilo-initrd-2.6.15-1-686: true
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