Hi, 
Same issue here. Since around 1,5 month laptop gets terribly slow when running 
on battery (was ok before). CPU usage runs close to 100% (but laptop is not 
heating up).
Ubuntu 12.10; Nvidia Quadro FX 1800M

"sudo pm-powersave false" helps with this issue. Thanks for tip Luis!

Please let me know if I can provide any meaningful info.

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https://bugs.launchpad.net/bugs/1172978

Title:
  Laptop becomes very slow on Battery

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