Information on XO-1 power efficiency

Christoph Derndorfer christoph.derndorfer at
Wed Nov 11 09:36:16 EST 2009

Hi all,

I've been invited to give a short talk on "Energy consumption of Desktop and
Notebook Computers" with a focus on the XO-1 design at a workshop in
Stockholm next week. The audience will mainly consist of scientists and
researchers working on IT topics within the context of energy consumption
and climate change.

Now while the original goal of getting the XO-1's power consumption down to
2W wasn't achieved it's still a pretty lean and efficient machine. I
obviously plan to talk about the choice of hardware components and MLJ's
display design. Another topic I'll touch upon is the wide-range voltage
input which allows for a variety of power sources to be used without
requiring further external regulation.

One thing I'm less sure about is the DCON because I'm don't know how
aggressively it is currently being used (maybe someone can shine a light on
this, I didn't find anything about it on the wiki or the mailing
list). Another question I'm interested in is what the efficiency of the
AC-DC adapters shipped with the XO-1 is?

I'm also wondering whether it makes sense to talk about some of the ideas
discussed in the early stages of the project (e.g. suspend inbetween
key-strokes which IIRC ended up not being implemented).

As I said it's only a short talk (10min max.) but there's anything else
significant when it comes to the power consumption and underlying design
that I've left out above then please give me a shout.


Christoph Derndorfer
co-editor, olpcnews
e-mail: christoph at
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