Top causes for wakeups:
  58.9% (949.1) [Rescheduling interrupts] <kernel IPI>
   9.5% (152.7) [i915] <interrupt>
   6.1% ( 97.9) swapper/1
   4.9% ( 78.9) swapper/0
   3.6% ( 57.6) swapper/3
   3.3% ( 53.5) swapper/2
   2.5% ( 40.7) USB device 1-1.2 : Apple Internal Keyboard / Trackpad (Apple Inc.)
   2.4% ( 38.7) [ehci_hcd:usb1] <interrupt>
   1.0% ( 16.5) compiz
   0.7% ( 11.8) [mmc0, b43] <interrupt>
   0.5% ( 8.1) [acpi] <interrupt>
   0.3% ( 5.0) syndaemon
   0.2% ( 4.0) unity-panel-ser
   0.2% ( 3.7) [TLB shootdowns] <kernel IPI>
   0.2% ( 2.7) [ata_piix, uhci_hcd:usb4] <interrupt>
   0.1% ( 2.0) kworker/1:1
   0.1% ( 2.0) indicator-multi
   0.1% ( 2.0) kworker/u:0
   0.1% ( 1.2) Xorg
   0.1% ( 1.0) gvfs-afc-volume
   0.1% ( 1.0) kworker/u:2
   0.1% ( 1.0) watchdog/0
   0.0% ( 0.7) indicator-cpufr
   0.0% ( 0.7) upowerd
   0.0% ( 0.5) kworker/1:0
   0.0% ( 0.3) accounts-daemon
   0.0% ( 0.3) unity-applicati
   0.0% ( 0.3) zeitgeist-datah
   0.0% ( 0.3) gnome-settings-
   0.0% ( 0.2) update-notifier