I found that
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echo -n 87 > /proc/acpi/video/VGA/LCDD/brightness
But then from root console it works.
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echo -n 87 > /proc/acpi/video/VGA/LCDD/brightness
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sleep 30 && echo -n 87 > /proc/acpi/video/VGA/LCDD/brightness
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(sleep 30 && echo -n 87 > /proc/acpi/video/VGA/LCDD/brightness ) &