There could also be another reason for the high power consumption.
A process called "beam.smp" is using constantly a little bit cpu and could 
prevent it going to sleep and thus power saving state.
See https://bugs.launchpad.net/ubuntu/+source/erlang/+bug/750009

So you could check if you have this process and problem too.

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https://bugs.launchpad.net/bugs/777930

Title:
  High power consumption and general overheat in ubuntu 11.04.

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