How to control the brightness of the display from command line?

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2012-01-17 | 01:12h
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2013-06-08 | 19:25h
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How to control the brightness of the display from command line?

You can set the brightness of the display by issuing this command within a shell

echo 3 > /sys/class/backlight/acpi_video0/brightness

where 3 is the brightness level. Its value is from 0 up to the value in the file /sys/class/backlight/acpi_video0/max_brightness.

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