I suppose this bug isn't hardware-specific.
Ubuntu kernels have CPU load balancing turned on, thus generating many 
"rescheduling" interrupts even under idle load.
And if CPU-intensive process is running, load balance ticks goes up to 500 per 
second.
This is not powersave friendly behaviour, but I don't know a solution other 
than make custom kernel build.

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Ienovo X200 power consumption - power top
https://bugs.launchpad.net/bugs/380293
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