[Powertop] Powertop usage

[Pascal Fontaine <Pascal.Fontaine at inria.fr>]

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Hi,

I have trouble understanding the output of powertop on my macbook air:

Power est.              Usage       Events/s    Category Description
   5.34 W    100.0%                      Device         USB device: 
Apple Internal Keyboard / Trackpad (Apple Inc.)
   889 mW     15.8 ms/s     168.2        Process /usr/bin/X :0 -auth 
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
   729 mW      2.9 pkts/s                Device Network interface: eth0 (wl)

despite tweaking everything possible about the Apple keyboard.  My 
global consumption is 8 Watts, so I find really strange 2/3 of it is in 
the keyboard.

Is, for some reason, powertop attributing to the apple keyboard the 
consumption overhead of the computer?

Thanks in advance for answers, and thanks to the powertop developers for 
their tool,

   Pascal