"acpitool --suspend" doesn't work on oneric

[Andrew M.]

what happens:
sudo acpitool --suspend
 Function Do_Suspend : could not open file : /proc/acpi/sleep.
 You must have write access to /proc/acpi/sleep to suspend your computer.

what I expect to happen:
computer should go to sleep

(i have /sys/power/state, and doing "sudo bash -c "echo 'mem' > /sys/power/state"" works great)

 lsb_release -r
Release: 11.10
poop@frameserver:~$ apt-cache policy acpitool
acpitool:
  Installed: 0.5.1-2
  Candidate: 0.5.1-2
  Version table:
 *** 0.5.1-2 0
        500 http://demonserver/mirror.anl.gov/pub/ubuntu/ oneiric/universe amd64 Packages
        100 /var/lib/dpkg/status

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.