Comment 56 for bug 373245

Both removing the wifi driver and disabling compositing seem not to change anything significantly.

Top causes for wakeups:
  38.1% (140.4) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
  17.6% ( 64.8) <interrupt> : PS/2 keyboard/mouse/touchpad
  11.0% ( 40.4) <interrupt> : ehci_hcd:usb1, uhci_hcd:usb2, HDA Intel, i91
   6.3% ( 23.2) <kernel IPI> : Rescheduling interrupts
   4.7% ( 17.3) chrome : schedule_timeout (process_timeout)
   4.1% ( 15.1) <interrupt> : ahci