ubuntu-phone team mailing list archive

[Alan Bell <alanbell@xxxxxxxxxx>]

On 04/01/16 16:20, Thomas Voß wrote:
> Now that is quite difficult, waking up the device from deep sleep just
> to maintain a cache is*very*  expensive in terms of battery,
> specifically as choosing a sensible timeout is almost impossible.
maybe update the cached location every time the screen comes on, if the 
cache is older than 5 minutes or so. That way if the screen is off for 
hours it will stay in low power, but if you turn on the screen it will 
start figuring out where it is if the cache is old enough that you might 
have moved a significant distance. This way it only does GPS when the 
device is active and screen on anyway, and by the time the user has got 
to the relevant screen that wants their location it will probably be 
ready to provide it.

Alan.