Comment 54 for bug 373245

I am also affected by this bug on my Dell Inspiron 640m.

Top causes for wakeups:
  31.4% (170.9) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
  23.5% (128.2) firefox : hrtimer_start_range_ns (hrtimer_wakeup)
  17.1% ( 93.1) <interrupt> : extra timer interrupt
  12.4% ( 67.3) <kernel IPI> : Rescheduling interrupts
   3.7% ( 20.1) xfce4-panel : hrtimer_start_range_ns (hrtimer_wakeup)
   2.0% ( 11.1) postgres : hrtimer_start_range_ns (hrtimer_wakeup)