[Testing] Final review for Power Management Requirements, Trial-2

[Jim Gettys]

On Thu, 2007-07-19 at 10:50 -0400, Kim Quirk wrote:
> Jim and others,
> I added your explanation to the Requirements since it isn't obvious to
> all the people who might read the requirements as to why the suspend
> button is a good thing:  http://wiki.laptop.org/go/Requirements
> 
> By the way -- since we have the suspend button now, maybe closing the
> lid should turn wireless off as well. On the rare case where the
> laptop is being used as a mesh relay, the student probably has to know
> that and has been instructed to leave his laptop open with antennas
> adjusted and hit the suspend button.  That would save a lot of
> power!! 
> 

If we can't get the power consumption down on wireless mesh, we'll need
to do this for sure.  It's a good suggestion, in any case.
                         - Jim


> Walter,
> Adding Walter to this email -- can you please review the Power
> Management Requirements at this link. The other topics on the
> Requirements page haven't had much discussion yet, but feel free to
> comment on those as well. 
> 
> 
> Thanks,
> Kim
> 
> 
> 
> On 7/19/07, Jim Gettys <jg at laptop.org> wrote:
>         
>         The difference is the following:
>         
>         If you've adjusted your antennae, closing the lid will destroy
>         the
>         adjustment, and take the antennae to the ground if the laptop
>         is on the
>         ground.
>         
>         Since we want the mesh up, this is *bad*.  Really bad....  So
>         closing 
>         the lid isn't good behavior to encourage.
>         
>         Explaining to a 7 year old under what circumstances an idle
>         governor
>         (which we don't have yet) will suspend the machine (or not) is
>         way to
>         complicated: what is more, only the kid knows if (s)he's
>         really done 
>         with what they were doing.
>         
>         So the point of the button press is an explicit way to force a
>         suspend,
>         preserve the mesh, and have something we can explain.
>         
>         The fact that it doesn't turn off the screen yet, as was
>         commented on 
>         before, is incorrect: pushing the power button should in fact
>         force a
>         suspend and turn everything off except wireless.
>                                              - Jim
>         
>         
> 
-- 
Jim Gettys
One Laptop Per Child