>> On Apr 24, 2008, at 10:39 PM, Frank Ch. Eigler wrote: >>> Opportunistic use of the on-board camera and the time-of-day clock >>> could yield such heuristics.
Just for reference, in my mind the best mechanism to do this on the current hardware would have been to use the battery-status LED "in reverse" to detect ambient light level: http://www.merl.com/papers/docs/TR2003-35.pdf. Unfortunately, all the display LEDs on our current hardware are behind drive transistors that make this impractical. For Gen 2, a simple photocell (or LED wired as such) would be sufficient to provide proper backlight power management while preserving privacy. I have discussed with Chris implementing a hackish "low-power mode" to demonstrate optimal power management on the Gen 1 hardware to illustrate the potential of the XO. Until software catches up, this would disable USB (hence wireless) and SD to allow sub-200ms resume; it might be interesting to make this manually-selected mode also do the camera-as-light-sensor trick to properly manage backlight intensity. The goal of this would be to show what battery life is possible; we could also enable/disable the backlight management separately to justify (or not) inclusion of a light sensor in Gen 2 hardware. --scott -- ( http://cscott.net/ ) _______________________________________________ Devel mailing list [email protected] http://lists.laptop.org/listinfo/devel
