On Tue, 2005-08-16 at 21:55 -0600, Alejandro Bonilla Beeche wrote: > On Tue, 2005-08-16 at 23:44 -0400, Steven Rostedt wrote: > > On Wed, 2005-08-17 at 13:29 +1000, Benjamin Herrenschmidt wrote: > > > On Wed, 2005-08-17 at 11:41 +1000, Benjamin Herrenschmidt wrote: > > > > > > > (I'm blind and I use a braille display. I use those functions to blank > > > > my laptop's screen so people don't read it, and hopefully to conserve > > > > power.) > > > > At the OLS I learned that the backlight of a laptop (when the screen is > > black, but still glows) actually spends more wattage than when the > > screen is lit. So, unless you actually turn the laptop display off, > > switching it to black will actually burn the battery quicker. > > This sounds stupid. Who told you this? The actual brightness is the one > that consumes the most battery. > > Seriously, who told you such thing? >
It was one of the speakers during the presentation. He seemed to know what he was talking about, in fact, I was caught so off guard by the statement, I got up and ask him the question again. "Did you say that the backlight of the laptop takes up more energy than when it is on?" and he replied "yes"! I rememeber this being in room C (could be wrong, I went to so many sessions). Looking at the program, it could have been "Linux Power Management" by Patrick Mochel. But I honestly don't remember which session it was. (I'm CCing him to see if he can clear things up :-) -- Steve - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
