[Bug 43961] Re: Power down after shutdown does not work...

[bierce]

This cured up on my home desktop system by making two changes.  One was
to add the kernel boot options "acpi=force lapic", as suggested above.

The second change was to use "halt -p" or "poweroff" to shut down the
machine.

This may strike everyone here as silly, but back in the day I do seem to
remember shutting down APM enabled laptops with a simple "halt" or
"shutdown -h now".  This used to cause a powerdown at the end of the
cycle.  It doesn't any longer, apparently, and the man pages do not lie.
Could it me that this is an added gotcha for people trying to sort out
this problem (which is a genuine problem -- halt -p was failing for me
previously, when I tried it).

The machine is based on an AOpen i945GTm-VHL socket 479 (Pentium-M)
motherboard.  Locally compiled 2.6.17.13 kernel.  APM is disabled, ACPI
is enabled.  Software suspend is enabled.  Boot options are:

  root=/dev/sda1 ro acpi=force lapic quiet splash vga=788

Other details are in the attached file.

** Attachment added: "Details from system that avoids erratic shutdown failure issue"
   http://librarian.launchpad.net/4703742/avoids-shutdown-bug.tar.gz

-- 
Power down after shutdown does not work...
https://launchpad.net/bugs/43961