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Re: LED backlight control?
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Re: LED backlight control?


  • Subject: Re: LED backlight control?
  • From: Michael Vannorsdel <email@hidden>
  • Date: Thu, 1 May 2008 15:16:12 -0600

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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