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SubjectHigher wake-up rate when running on battery
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I can observe a strange behaviour wrt timer wake-ups when looking at powertop:

- when running on AC, about 8 wake-ups per second.

- when running on battery, the number of wake-ups grows to about 11 and the
main wake-up producers are:
23.1% ( 3.9) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
19.2% ( 3.2) <interrupt> : acpi


[ These wake-up rates refer to X running KDE4, wi-fi off (by physical switch)
and no usb device connected. ]

Is this a normal behaviour?



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