Re: [Powertop] USB devices get wrong power use values

[Arjan van de Ven <arjan at linux.intel.com>]

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>
> So note that it's actually a very small USB widget that behaves as a
> keyboard (it's an OTP token).
> I've only had that OTP token show as 7W once, and it was suspicious that
> it was at the exact same time as my built in camera.
>
> So from what you're staying, you're pretty sure that the measuring code
> was correct and that somehow the USB system was wedged or that power
> management suspend failed in a way that both devices were taking 14W
> together, more than what the entire laptop uses when on batteries with
> CPUs mostly asleep?

well powertop cannot measure, only model these things
if you go WAAAY outside the current model (by adding devices never seen before)
the accuracy will go up over time, but initially might be off by a bit.