On Mon, 15 Dec 2008, John Gilmore wrote: >> On a different note, one test we might think about running is the >> closest thing the industry has to a "standard" battery life test. It's >> specified on a lot of the netbook specs. >> >> It's defined here: http://it.jeita.or.jp/mobile/e/index.html >> >> However, I'm also seeing that a lot of vendors are choosing not to use >> this test because it generally results in a number higher than what the >> typical user will actually get. > > I looked it over. Companies report the average of two measurements: > The hours of power available when the machine is dialed down to > minimum power, screen at its very dimmest (reflective mode for us), > doing nothing, everything disabled. And the other measurement is when > the system is playing back an MPEG movie, in a small window and with > relatively standard OS and display settings. (We can't do this out of > the box, but we could install an MPEG codec for the test, and run it > that way. Or transcode their test movie to Ogg Theora and try that > for simplified release testing, until we have to report an official > number using MPEG.) > > It would be useful for us to measure and improve the numbers in > both of those modes -- but the average will be highly misleading to > everyone. Still, it would provide a comparison to netbooks and other > computers. > > It would be nice if our runtime in the minimum power mode could in > 9.1.0 be almost equal to our "lid-closed suspend time", which I > measured in #7879 to be 8 hours with mesh/wifi chip on, and 44+ hours > with the mesh/wifi off. Actually, it won't be that good, because the > test requires that the screen remain on (perhaps consuming 0.5W), > though the reflective screen means we can turn off the backlight. So > perhaps we'll get 16 to 20 hours in that mode. If so, averaging with > perhaps 2 to 4 hours of active runtime, for a total "standard" number > of about 10 to 12 hours would still be pretty good by comparison to > typical netbook products.
as-is you are pretty good. I used the XO to follow presentation slides recently. with wifi and the backlight off I went from 9-5 and showed a bit more than half the battery life left (not a lot of activity, just moving the slides periodicly, but never idle enough to let it turn off the screen). so your 16 or so hours looks pretty reasonable. David Lang _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
