my past research of the above mentioned utilities revealed that they don't actually change the brightness of the backlight like the F1 and F2 keys on specific keyboards or the brightness slider in the Displays Preference Pane. they all seem to change the color settings or draw a semi-transparent black window over the screen.

the only solution i've found so far is the source for a command line program, display-brightness.c. found at the bottom of the following page, http://osxbook.com/book/bonus/chapter10/light/. only laptop displays are mentioned on the page, don't know if it'll work for desktop LCD displays, no idea about CRTs.

you can check if your utility is changing the backlight by looking at the apple on the back of your display.



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Unfortunately even this one doesn't go below minimal brightness level achieved through keyboard ...

it's a pity : /
means no real solution?

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