Comment 51 for bug 373245

Dell Inspirion 1520, Core2 Duo.
Kubuntu Karmic without ubuntuone, mono, couchdb, ...

Linux afbook 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 17:01:44 UTC 2009 x86_64 GNU/Linux

Top causes for wakeups:
  21,0% ( 37,5) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
  13,3% ( 23,8) <interrupt> : extra timer interrupt
  13,0% ( 23,2) plasma-desktop : hrtimer_start_range_ns (hrtimer_wakeup)
   8,8% ( 15,7) konqueror : hrtimer_start_range_ns (hrtimer_wakeup)
   5,7% ( 10,2) <kernel IPI> : Rescheduling interrupts
   5,6% ( 10,0) <interrupt> : b43, eth0
   5,6% ( 10,0) skype : hrtimer_start_range_ns (hrtimer_wakeup)

There is also a lot of "extra timer interrupt" wakeups.
"tick_sched_timer" sometimes near 100 wakeups per second.