Comment 10 for bug 118808

Here is my powertop output on a macbook 3rd generation with madwifi-ng trunk. madwifi is still generating a decent number of wakeups but not as bad as before.

Cn Avg residency P-states (frequencies)
C0 (cpu running) ( 4.5%) 2.17 Ghz 0.9%
C1 0.0ms ( 0.0%) 2.00 Ghz 0.0%
C2 5.2ms ( 8.1%) 1.84 Ghz 0.0%
C3 6.9ms (87.4%) 1000 Mhz 99.1%

Wakeups-from-idle per second : 143.7 interval: 15.0s
Power usage (ACPI estimate): 13.8W (1.2 hours) (long term: 13.3W,/1.3h)

Top causes for wakeups:
  45.1% ( 83.4) <interrupt> : wifi0
  16.4% ( 30.4) <interrupt> : uhci_hcd:usb4, eth0, i915@pci:0000:00:02.0
   6.4% ( 11.8) <kernel module> : usb_hcd_poll_rh_status (rh_timer_func)
   6.0% ( 11.1) S20powernowd : queue_delayed_work_on (delayed_work_timer_fn
   4.2% ( 7.7) sleep.sh : queue_delayed_work_on (delayed_work_timer_fn
   3.5% ( 6.5) <interrupt> : acpi

Suggestion: Enable USB autosuspend by pressing the U key or adding
usbcore.autosuspend=1 to the kernel command line in the grub config