Is there a way to read the current value of the 1.75's ambient light sensor? It'd be neat if that could be displayed by an activity.
-- Nick Doiron Code for America On Apr 9, 2012 9:16 AM, "Paul Fox" <[email protected]> wrote: > i just sent this to the folks working on the current doc sprint, and > then realized it probably deserves a wider audience. operation of the > brightness keys was enhanced a bit in 11.3.1, based on discussion on > the devel list, but i don't recall that i ever sent out a summary mail. > > for convenience, i'm going to refer to the brightness keys as BrUp and > BrDown here. > > on all laptops, in all sofware releases to date: > > - the unmodified BrUp and BrDown keys adjust the brightness in 15 > steps. when turning the backlight all the way off (i.e., > the lowest setting) the display will switch into the higher > resolution monochrome mode. > > - using the Alt-BrUp and Alt-BrDown combinations will immediately > change the backlight to its maximum and off values (including the > change to monochrome when off). > > in release 11.3.1 and later, on all laptops: > > - the Ctrl-BrUp and Ctrl-BrDown combinations don't actually change > the backlight level, but rather will toggle the screen between > "normal" mode and the higher resolution monochrome mode. this > monochrome mode will be sticky, so further normal use of the > keys will adjust the brightness but won't restore color. this > can be useful if you want the higher resolution, and don't > currently need to have color displayed. unfortunately, there > is currently no way to enter this "semi-permanent monochrome > mode" via the Sugar user interface -- only Ctrl-BrDown will do it. > > and finally, on XO-1.75 only: > > - the backlight may automatically turn off when the laptop is in > bright sunlight. when this happens, it is _not_ put into the > hi-res monochrome mode. when the light level returns to > "normal" -- i.e., indoor or shady light -- the backlight will > be restored to its previous value. > > the ambient light sensor shares the opening in the plastic > with the LED that looks like "(o)" near the lower left corner > of the screen, so covering that location when outside, or > shining a bright light on it when inside, may cause the > backlight level to change. > > > it's also worth noting that the F9 and F10 keys are, by default, the > brightness keys, and are intercepted by system software before a > running program can receive them. if the Fn key is pressed at the > same time as F9 or F10, then the keys instead generate the true F9 and > F10 codes, and are available to the current application (or perhaps > the window manager). this is also true of the volume keys on F11 and > F12 -- on any of our keyboards, holding Fn will force the top row of > keys to generate F1 through F12. > > finally: all of the above functionality is available from the > shell commandline: > > $ olpc-brightness -h > usage: olpc-brightness [up|down|max|min|<0-15>|color|mono] > > > paul > =--------------------- > paul fox, [email protected] > _______________________________________________ > support-gang mailing list > [email protected] > http://lists.laptop.org/listinfo/support-gang >
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