Hi,

This is the same on IOS devices.  The backlight is still on.

Ricardo Walker
rica...@appletothecore.info
Twitter:@apple2thecore
www.appletothecore.info

On Aug 15, 2012, at 12:22 PM, Chris Blouch <cblo...@aol.com> wrote:

> Not sure on devices but for laptops it just sets the pixels to black, so the 
> backlight is still running. If you want to save battery you need to use F1 
> and turn the screen all the way down. All the way down turns the backlight 
> off. Likewise using F5 to turn the keyboard backlight all the way down will 
> also shut those lights off.
> 
> CB
> 
> On 8/15/12 11:18 AM, Teresa Cochran wrote:
>> Ok, one of my notorious "just wondering" questions.
>> 
>> I've heard many discussions about whether screen curtain saves battery life 
>> in laptops and the smaller devices. I'm wondering if screen curtain works by 
>> modifying information that's already been passed to the display, or whether 
>> it bypasses the display altogether. If it's used on an Ipod, for example, 
>> does it still use a lot of resources? Does anyone know how it works, 
>> technically speaking?
>> 
>> Thanks,
>> Teresa
>> 
> 
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