XO power management
pgf at laptop.org
Thu Mar 24 11:20:44 EDT 2011
> OK. Great. Is the attached version newer than the one in Sugar 0.88??
> Because the latest dextrose image is mainly based on Sugar 0.88
> 2011/3/24 Richard A. Smith <richard at laptop.org>
> > On 03/24/2011 10:41 AM, Ismael Schinca wrote:
> > I'm planning to use different XO's, all of them 1.0 hardware. I
> >> definately won't be able to finish today because they all have different
> >> OS images and I think it would be best if I update them all (even for
> >> future tests). Maybe tomorrow, maybe monday.
> > Yes certainly please use the same image on all of them. If you have to
> > install software then please use the latest version of olpc-pwr-log. I have
> > it attached to this mail.
> > I think it will be very hard to perform the same test under the same
> >> conditions as you suggest because:
> >> - It will be very time consuming (though it doesn't need a lot of
> >> attention during the test)
> > My goal is to automate the test and use a very short test window. ie 20
> > minutes or so.
> > - The air conditioning in our building is quite frankly chaotic so
> >> temperature is really variable (which is actually a lot worse for us
> >> humans than batteries ;) )
> > Yes. Sorry my use of the word exactly was probably too strong. I don't
> > mean that it has to be 25 degC ambient and only that temperature. The temp
> > fluctuations in a air conditioned office should be within reason. I just
> > don't want the profiles generated in an office and then the test run in a
> > outside warehouse at 33C. Or the curves generated on a XO-1 with build 8.2
> > but the test run on a 1.5 with build 10.1.3. That sort of thing.
> > The closer I might get, which I think could be pretty close is:
> >> - Install the SAME fresh OS image and firmware version on all the test XOs
> >> - Disable power management in every XO.
> > and dpms. xset -dpms from the sugar terminal other wise the screen will
> > turn off in 20 minutes and change the power draw.
> > - The laptops batteries are mostly charged, so it will be a charge after
> >> discharge, so I think temperature there is less of a concern
> >> - Run the tests at the same time in every XO
> > Yes. I believe that will work fine.
> > Note: I'm getting on a plane in a few minutes so this will be my last
> > e-mail until much later on today. Possible tonight or tomorrow.
> > --
> > Richard A. Smith <richard at laptop.org>
> > One Laptop per Child
> Ismael Schinca
> Centro Ceibal - Depto. Técnico - I+D
> Avda. Italia 6201 - Edificio Los Ceibos
> Montevideo - Uruguay.
> Tel.: 2601 57 73 Int. 2232
> part 2 text/plain 129
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