Comment 66 for bug 373245

Same problem here with Karmic, kernel 2.6.31-20-generic. Battery life decreased to 30% of that in Jaunty (1h to 20 min.).

Top causes for wakeups:
  28.6% ( 44.7) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
  13.6% ( 21.3) <interrupt> : extra timer interrupt
   8.1% ( 12.7) <interrupt> : ehci_hcd:usb2, uhci_hcd:usb3, uhci_hcd:usb5
   7.9% ( 12.3) firefox : hrtimer_start_range_ns (hrtimer_wakeup)
   7.9% ( 12.3) /sys/bus/usb/devices/2-1.1.1
   7.0% ( 11.0) <kernel core> : hrtimer_start (tick_sched_timer)
   6.8% ( 10.7) <kernel IPI> : Rescheduling interrupts