Checkout this code sample:
http://osxbook.com/book/bonus/chapter10/light
it shows setting the display brightness and dealing with the ambient
light sensor on portables using IOKit.
On May 1, 2008, at 3:05 PM, Rick Mann wrote:
Hi. I was posting questions on Carbon Dev, but this is probably more
appropriate.
I'm interested in developing a utility that allows the user to dim
the screen and change the output to red, for very dark area use
(i.e. astronomy). I've figured out how to use
CGSetDisplayTransferByFormula() to make the screen red, and I can
even make it fairly dark, but it's still far too bright.
While CCFL backlights can only dim so far, LED backlights can
theoretically dim all the way to "off." However, the standard
backlight controls don't go anywhere near "off" before turning the
backlight all the way off.
Is there any way (perhaps even low-level communications with the
hardware, such as I've seen to get the light sensor and
accelerometer readings) to programmatically set the backlight level
very low?
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