[Bug 36158] Re: System does not power off on shutdown

Tsang Han Wong tsanghan at yahoo.com
Thu May 25 18:30:34 UTC 2006

I too have encounter the "system does not poweroff on shutdown" problem
when I upgraded the kernel from 2.6.12-9 to 2.6.15-22.

Under kernel-2.6.12-9, there is a /proc/acpi directory, where as under
kernel-2.6.15-22, /proc/acpi was missing. I read somewhere the acpi was
to be moved to /sys, but i couldn't fine it there.

>From the same cource, it suggest that acpi function for BIOS that is
older then year 2000 is not supported.

Then I recalled I saw a kernel configuration option for 2.6.15-22 under
the ACPI section with the number 2000, the option is

When I check this CONFIG_ACPI_BLACKLIST_YEAR option in the config file
for kernel-2.6.12-9, the option was set to 0.

The next clue to confirm the findings was from dmesg,

ACPI: BIOS age (1999) fails cutoff (2000), acpi=force is required to
enable ACPI

So i added "acpi=force" to menu.lst, and rebooted, this soft the "no
power off" problem for me.

Now the next question is, why is kernel-2.6.15-22 compiled with
CONFIG_ACPI_BLACKLIST_YEAR=2000 where this was set to 0 in

Is this a policy by Ubuntu or from upstream Debian? What is the
consquence if we reconfigure and recompile the kernel to set
CONFIG_ACPI_BLACKLIST_YEAR=0 for kernel-2.6.15-22?

Also from #31993 Peter Whittaker suggected that "acpi=force" is not a
work around for him because of the "S3 sleep" (whatever that is), will
setting CONFIG_ACPI_BLACKLIST_YEAR=0 solve his problem too? Since
kernel-2.6.12-9 works fine with that.

System does not power off on shutdown

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