Comment 67 for bug 760131

Well, just tried to install Karmic on the same Vaio VGN-SR21M, and here are the results.

Wakeups in the range of 20 - 30, while I thought that the 120 - 150 range was the norm.
It seems to me that the consumption level rised with Maverick, since I also tested a Lucid server that stays around 20 - 30 all the time.

Results are for the Vaio laptop.

Linux ubuntu 2.6.31-14-generic #48-Ubuntu SMP Fri Oct 16 14:04:26 UTC 2009 i686 GNU/Linux

Cn Avg residency P-states (frequencies)
C0 (cpu running) ( 0.0%) 2.27 Ghz 0.3%
polling 0.0ms ( 0.0%) 2.27 Ghz 0.1%
C1 mwait 0.0ms ( 0.0%) 1.60 Ghz 0.0%
C2 mwait 0.0ms ( 0.0%) 800 Mhz 99.6%
C3 mwait 47.0ms (100.0%)

Wakeups-from-idle per second : 21.4 interval: 15.0s
no ACPI power usage estimate available

Top causes for wakeups:
  23.1% ( 6.3) <kernel core> : hrtimer_start (tick_sched_timer)
  16.3% ( 4.5) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
  14.6% ( 4.0) <kernel core> : usb_hcd_poll_rh_status (rh_timer_func)
  12.9% ( 3.5) <interrupt> : extra timer interrupt
  11.9% ( 3.3) <interrupt> : ahci
   4.9% ( 1.3) <kernel core> : neigh_periodic_timer (neigh_periodic_timer)