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Bug#271116: kernel-source-2.6.8: Crashes upon pressing ACPI buttons (e.g., laptop lid detect button)



Package: kernel-source-2.6.8
Version: 2.6.8-5
Severity: important


I'm using the Debian 2.6.8 kernel on a Dell Latitude D600 laptop.  With
2.6.8-1, things worked fine.  With 2.6.8-5, if at any time I press the
button that detects lid close (which should normally generate an ACPI
event "button/lid"), the system instantly locks up hard.

This is true from the very beginning of the boot up sequence; while the
BIOS correctly turns the screen on and off in response to this button
while I'm on the Grub menu, if I select the 2.6.8-5 kernel and then, as
fast as I can, hit the lid button, the kernel freezes, extremely early in
the bootup sequence.  Obviously userspace and modules are not relevant,
then, since they never get a chance to start/be loaded...  (It doesn't
matter, though, when I actually hit the button; if I don't touch the
button it will boot normally, I can start programs, etc., but even then,
as soon as I touch the button the computer instantly stops responding to
any input and the screen stops updating and no messages are left in any
logs.)

I figured it was probably a bug in ACPI, which I originally had enabled,
so I first disabled ACPI support for buttons (CONFIG_ACPI_BUTTON), and
then disabled ACPI altogether and enabled APM instead (CONFIG_APM=y,
CONFIG_APM_CPU_IDLE=y), and in all three configurations the bug manifested
in exactly the same way.

Attached is my original kernel configuration with ACPI enabled, that
worked fine with 2.6.8-1 but not with 2.6.8-5.

-- System Information:
Debian Release: 3.1
  APT prefers testing
  APT policy: (700, 'testing'), (600, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.4.26
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8

Versions of packages kernel-source-2.6.8 depends on:
ii  binutils                   2.14.90.0.7-8 The GNU assembler, linker and 
bina
ii  bzip2                      1.0.2-1       A high-quality block-sorting file
ii  coreutils [fileutils]      5.2.1-2       The GNU core utilities

-- no debconf information

Attachment: config-2.6.8
Description: Binary data


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