[Bug 373245] Re: karmic: wakeups <kernel core> : hrtimer_start_range_ns (tick_sched_timer)

[Mark Greenwood]

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.

-- 
karmic: wakeups  <kernel core> : hrtimer_start_range_ns (tick_sched_timer) 
https://bugs.launchpad.net/bugs/373245
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