Public bug reported:

This bug relates to the 'services-admin' tool on edgy.

I used services-admin to not stop acpid (and not start during bootup).
This worked fine. Then after booting up a few times I re-enabled acpid
in the services-admin tool. But for some reason it wouldn't start and
gave this error:

/proc/acpi/event: Device or resource busy

After some investigation I found that the hald daemon (started by dbus)
was starting up before acpid and was spawning hal-addon-acpi. It looks
like hal-addon-acpi takes control of the /proc/acpi/event file making it
inaccessible to acpid.

The only reason for this error I can think of is that services-admin
possibly reordered the start acpid (to occur after hald).

Manually changing /etc/rc2.d/S50acpid to /etc/rc2.d/S10acpid fixed the
problem.

** Affects: gnome-system-tools (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

-- 
services-admin reorders acpid startup
https://launchpad.net/bugs/69799

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