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# Powertop

         PowerTOP version 1.11      (C) 2007 Intel Corporation

    < Detailed C-state information is not P-states (frequencies)

    Wakeups-from-idle per second : 21.7     interval: 5.0s
    no ACPI power usage estimate available

    Top causes for wakeups:

      19.2% ( 17.0)       <interrupt> : uhci_hcd:usb4, HDA Intel, i915@pci:0000:00:0
      18.5% ( 16.4)     <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
      18.1% ( 16.0)   USB device  4-1 : Mass Storage Device (Generic)
       9.5% (  8.4)             xchat : hrtimer_start_range_ns (hrtimer_wakeup)
       8.6% (  7.6)     <kernel core> : hrtimer_start (tick_sched_timer)
       5.6% (  5.0)         kblockd/1 : blk_plug_device (blk_unplug_timeout)

    Suggestion: Disable 'hal' from polling your cdrom with:
    hal-disable-polling --device /dev/cdrom 'hal' is the component that auto-opens a
     Q - Quit   R - Refresh  K - kill hald-addon-storage

Notice that if I want to try implementing the suggestions, like stopping hald-addon-storage, powertop can do it for me right then and there.

The amazing thing is, when I ran powertop to make this slide, I didn't even have a CDROM drive plugged in. And hal was STILL polling it!

But it gets worse. I had already disabled hald-addon-storage once -- but when I did a dist-upgrade to get the latest security fixes, Ubuntu put it back!