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Helpful answers
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Mar 5, 2016 9:58 AM in response to occidental touristby dominic23,1. System Preferences > Keyboard > Keyboard
Deselect the option “Automatically illuminate keyboard in low light”.
2. Press F5 key on the keyboard repeatedly to the lowest,
so that all blocks seen on the feedback graphics are darkened.
“You can also turn off the automatic backlighting feature in the Keyboard preferences.
Deselect the option "Automatically illuminate keyboard in low light" to use the F5 and F6 keys
to adjust the keyboard backlight independent of ambient lighting.”