Comment 60 for bug 373245

Same problem here, Sony VAIO laptop with Intel Core II Duo, NVIDIA graphics (so this isn't Intel graphics related).

I'm lucky to get 45 minutes battery life, compared to 3 hours under Windows.

Top causes for wakeups:
  21.5% ( 63.2) <kernel IPI> : Rescheduling interrupts
  21.0% ( 61.7) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
  20.6% ( 60.6) <interrupt> : nvidia
  10.2% ( 30.1) firefox : hrtimer_start_range_ns (hrtimer_wakeup)
   5.8% ( 17.1) <interrupt> : extra timer interrupt
   4.3% ( 12.7) <interrupt> : ehci_hcd:usb2, uhci_hcd:usb5
   4.3% ( 12.7) USB device 5-2 : Optical Mouse ( KYE )

(This was taken when running under mains power. Under battery power it is similar except nvidia drops off the list, so I doubt this is graphics card related at all).

uname -a
Linux hoss 2.6.31-18-generic #55-Ubuntu SMP Fri Jan 8 14:55:26 UTC 2010 i686 GNU/Linux

This is a serious problem. Battery life of 1/4 that under Windows is not acceptable.