Comment 24 for bug 177895

On Ubuntu hardy
Kernel: Linux fenix 2.6.24-4-generic #1 SMP Mon Jan 14 17:30:39 UTC 2008 i686 GNU/Linux

powertop output (after following all sugerences):

Cn Avg residency P-states (frequencies)
C0 (cpu running) (25.7%) 2.21 Ghz 15.4%
C1 0.0ms ( 0.0%) 2.21 Ghz 0.0%
C2 0.2ms ( 0.4%) 1200 Mhz 1.2%
C3 1.5ms (73.9%) 800 Mhz 83.4%

Wakeups-from-idle per second : 512.4 interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  46.8% (368.7) <kernel IPI> : Rescheduling interrupts
  10.6% ( 83.3) <interrupt> : i915@pci:0000:00:02.0
   9.3% ( 73.6) pidgin : schedule_timeout (process_timeout)
   7.2% ( 57.0) <interrupt> : uhci_hcd:usb2, uhci_hcd:usb4, HDA Intel
   6.5% ( 51.0) firefox-3.0 : schedule_timeout (process_timeout)
   5.2% ( 41.3) firefox-3.0 : futex_wait (hrtimer_wakeup)
   3.6% ( 28.0) Xorg : do_setitimer (it_real_fn)
   2.7% ( 20.9) gnome-panel : schedule_timeout (process_timeout)
   2.2% ( 17.4) <interrupt> : extra timer interrupt
   1.3% ( 10.2) USB device 4-2 : USB-PS/2 Optical Mouse (B16_b_02)
   1.0% ( 8.0) <kernel module> : usb_hcd_poll_rh_status (rh_timer_func)
   0.9% ( 7.0) compiz.real : schedule_timeout (process_timeout)
   0.4% ( 2.8) trackerd : schedule_timeout (process_timeout)
   0.2% ( 1.6) xfsbufd : schedule_timeout (process_timeout)
   0.2% ( 1.2) /usr/share/reve : schedule_timeout (process_timeout)
   0.2% ( 1.2) nm-applet : schedule_timeout (process_timeout)
   0.1% ( 1.1) netspeed_applet : schedule_timeout (process_timeout)
   0.1% ( 1.0) <kernel IPI> : TLB shootdowns
   0.1% ( 1.0) ntpd : do_setitimer (it_real_fn)
   0.1% ( 1.0) dhcdbd : schedule_timeout (process_timeout)
   0.1% ( 1.0) NetworkManager : input_open_polled_device (delayed_work_timer_fn)
   0.1% ( 1.0) NetworkManager : tg3_open (tg3_timer)