The way an LCD panel works is there are jillions of small 'windows'
which open or close a certain amount to increase the amount of light let
through for each pixel. Screen curtain tells all the windows to close
but that doesn't mean the backlight isn't still running full bore and
draining your battery. The only way to stop that is to turn down the
brightness all the way by hitting the F2 key about 20 times. Then it
doesn't matter if screen curtain is on or not. You can do the same thing
by using the Displays preference and interacting with the brightness
slider to set it to 0 percent. This one of those annoying sliders that
doesn't tell you what value it is changing to as you arrow up/down or
left/right so you have to VO-arrow off of it and back on to find out if
you reached 0 yet. I had to left-arrow about 21 times to get from full
bright to 0% brightness.
There is also backlighting on the keyboard which can be turned off by
hitting F5 about 20 times. I couldn't find a software way to fiddle with
this but I might have missed it.
CB
On 6/19/13 10:10 PM, Nicholas Parsons wrote:
HI,
Thanks for the comments and info.
I'm not really fussed about overkill. What I particularly want to know is, if I
turn the screen curtain on, will this undermine any benefit of having the
screen brightness at 0? I understand screen curtain does not turn the screen
off, but is it therefore the same as having it on with low brightness? I kinda
got mixed messages from you both but what I think you're both saying is that
screen curtain makes no difference so I can have it on and brightness set to 0
and this will conserve some battery life. Is that right?
Thanks again for your help.
Nic
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