As has been mentioned, the video card is still driving the LCD display with the backlight off, but the bulk of the energy cost is the backlight, not the LCD. This is why LCD displays such as clocks or thermometers can run for months off a little battery. So while you're not going to hit 0% energy use, it's going to be a lot less than having some backlight on.
CB Justin Harford wrote: > Yes it turns off the backlighth completely, but the pixels are still > showing your desktop, making it discernable if for example you are > sitting out in the sun. > On Jul 6, 2009, at 7:40 AM, James & Nash wrote: > >> No I don't think you are Scott. However, I did read someone that >> turning down the screen brightness to zero actually turns off the >> backlight on the screen - effectively turning it off. I just wondered >> if this was possible as I have no need for a screen bu from waht I >> remember turning down the screen brightness increased batery life >> dramatically. >> >> Thanks >> >> James >> >> ----- Original Message ----- >> *From:* Scott Howell <mailto:[email protected]> >> *To:* [email protected] >> <mailto:[email protected]> >> *Sent:* Monday, July 06, 2009 2:04 PM >> *Subject:* Re: Turning off MacBook screens? >> >> James, why is that a shame? Surely you recognize that turning off >> the screen would generally not make a lot of sense. These aren't >> machines designed exclusively for the blind, so turning off the >> screen would only benefit those of us who would not typically use >> the screen. It just isn't one of those features Apple or any >> other computer manufacturer would really consider. You have the >> option to turn the screen brightness down to the point where no >> one could read it and that alone would help conserve battery >> life. However, to say it is a shame seems a little odd when you >> consider the larger scope here. I am not sure what purpose this >> feature would serve even on a lInux machine, but maybe there is >> something I'm missing here beyond the possible extension of >> battery life. >> On Jul 6, 2009, at 8:43 AM, James & Nash wrote: >> >>> Thanks Scott, >>> >>> That is a real shame I think. >>> >>> Take care >>> >>> James >>> >>> ----- Original Message ----- >>> *From:* Scott Howell <mailto:[email protected]> >>> *To:* [email protected] >>> <mailto:[email protected]> >>> *Sent:* Monday, July 06, 2009 10:46 AM >>> *Subject:* Re: Turning off MacBook screens? >>> >>> Screen curtain does not turn the screen off. If you turn the >>> brightness down as far as it will go, that will help save >>> your battery, but I do not believe you can turn the screen >>> off entirely-in other words cut power to it. >>> On Jul 6, 2009, at 5:38 AM, James & Nash wrote: >>> >>>> Hi, >>>> >>>> Am I corect in thinking that the Linux commandline options >>>> will work under Mac OS X? If so, if I could find out how to >>>> write shell scripts or whatever they are called do you >>>> think they would work under Mac OS X? Also, do the Screen >>>> Brightness and Screen Curtain options actually turn the >>>> screen off? >>>> >>>> Take care >>>> >>>> james >>>> >>>> ----- Original Message ----- >>>> *From:* Alex Jurgensen <mailto:[email protected]> >>>> *To:* [email protected] >>>> <mailto:[email protected]> >>>> *Sent:* Monday, July 06, 2009 5:22 AM >>>> *Subject:* Re: Turning off MacBook screens? >>>> >>>> Hi, >>>> James, >>>> >>>> Just continue with Screen Brightness and Screen Curtain >>>> together. I should write a CLI script for this. >>>> >>>> Regards, >>>> Alex, >>>> >>>> >>>> On 5-Jul-09, at 2:39 PM, James & Nash wrote: >>>> >>>>> Hi folks, >>>>> >>>>> This might sound like an odd question, but as i cannot >>>>> see the screen I was wondering if there was a way to >>>>> turn it off? I know that you can turn the screen >>>>> brightness right down and use the Screen Curtain which >>>>> effectively does this which was what I used to do. But >>>>> I was wondering if there was a solution via the >>>>> Command Line. In Linux, this can be achieved by >>>>> something like dpms off. This keeps the screen off >>>>> until you either use dpms on our restart the pc. >>>>> >>>>> I have tried turning off my laptop screen in Windows, >>>>> and JFW doesn't like it too much. As VO is built >>>>> directly into the system i assume it doesn't use video >>>>> intercept but instead gets its access info direct from >>>>> the Mac OS X kernel? >>>>> >>>>> Thanks for any help that you can provide >>>>> >>>>> Thank you for taking the time to read this. >>>>> >>>>> Take care >>>>> >>>>> James >>>>> >>>>> >>>>> >>>> >>>> >>>> >>>> >>>> >>> >>> >>> >>> >>> >> >> >> >> >> > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "MacVisionaries" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/macvisionaries?hl=en -~----------~----~----~----~------~----~------~--~---
