Public bug reported:

When I run powertop on my Thinkpad X61s, it suggests me a couple of
things I expected ubuntu to do on it's own.

e.g.

Suggestion: Enable wireless power saving mode by executing the following command
:
  echo 5 > /sys/bus/pci/drivers/iwl4965/0000:03:00.0/power_level

Suggestion: Enable USB autosuspend by pressing the U key or adding
usbcore.autosuspend=1 to the kernel command line in the grub config

Suggestion: Enable SATA ALPM link power management via:
  echo min_power > /sys/class/scsi_host/host0/link_power_management_policy

** Affects: ubuntu
     Importance: Undecided
         Status: New

-- 
Ubuntu doesn't save power on it's own
https://bugs.launchpad.net/bugs/258178
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