Impacts of disabling Automatic Power Management

Gary Martin garycmartin at
Wed Feb 1 00:09:15 EST 2012

On 1 Feb 2012, at 04:43, Paul Fox wrote:

> sridhar wrote:
>> We are considering disabling Automatic Power Management because of its
>> impact on collaboration and 3G connectivity.
>> What kind of battery life can we expect from an XO-1.5 with Automatic
>> Power Management disabled as opposed to enabled? I understand that
>> this can vary wildly with usage, but is there an average estimate?
> he's on a very long plane flight, but i'll try and channel richard:
>    "it depends."
> how did i do?  :-)
> you're probably in as good a position to answer this as we are, since
> you have a better idea of your system activity load.  with automatic
> power management turned off, a 1.5 is good for several hours of use,
> where "several" is intentionally vague.  backlight on full?  wireless
> on?  continuous cpu activity?  etc.
> would it help to disable automatic power management only when specific
> Activities are running?  only when certain kinds of collaboration are
> in effect?  only when certain drivers are active?

Thanks Paul, yes excellent point. With my Activity Team hat on, Sridhar if you could please expand a little on the test cases you are hitting Activity collaboration issues with, so that we can try and resolve or minimise issue from Automatic Power Management kicking in. There are already a number of Activities that programatically keep the machine awake – a simple example is Clock, who wants the clock display to continuously keep stopping as if there's sand stuck in the gears ;)


> paul
>> Thanks,
>> Sridhar
>> Sridhar Dhanapalan
>> Engineering Manager
>> One Laptop per Child Australia
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> paul fox, pgf at
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