usb and hald-addon-cpufreq main cause of wakeup

[Nick Brown]

My system appears to never get C3 and the main causes of wakeups are usb 
interrupts and the hald-addon-cpufreq process.

Cn          Avg residency (5s)  Long term residency avg
C0 (cpu running)        ( 5.2%)
C1                0.0ms ( 0.0%)                   0.0ms
C2                3.9ms (94.8%)                   1.2ms
C3                0.0ms ( 0.0%)                   0.0ms
C4                0.0ms ( 0.0%)                   0.0ms

Wakeups-from-idle per second :  246.0
Power usage (ACPI estimate) :  13.8 W (0.1 hours left)

Top causes for wakeups:
  28.5%        <interrupt> : uhci_hcd:usb1, uhci_hcd:usb2, ehci_hcd:usb3, 
uhci_\
  20.1%    hald-addon-cpuf : queue_delayed_work_on (delayed_work_timer_fn)
  12.6%              beryl : schedule_timeout (process_timeout)
   8.0%            beagled : schedule_timeout (process_timeout)
   6.1%               Xorg : do_setitimer (it_real_fn)
   5.5%      mixer_applet2 : schedule_timeout (process_timeout)
   3.3%           epiphany : schedule_timeout (process_timeout)
   2.9%        <interrupt> : ide1
   2.0%                tpb : do_nanosleep (hrtimer_wakeup)
   1.1%    gnome-power-man : schedule_timeout (process_timeout)