XO power management

[Paul Fox]

ismael wrote:
 > OK. Great. Is the attached version newer than the one in Sugar 0.88??

almost certainly.

paul


 > 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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=---------------------
 paul fox, pgf at laptop.org