To solve this problem on elementary OS Luna,
- Enter the following command into slingshot.
- Insert the following code above exit 0.
- Close rc.local file. Scratch text editor will auto-save the file. Done.
gksu scratch-text-editor /etc/rc.local
echo 7 > /sys/class/backlight/acpi_video0/brightnessNote: Number 7 indicates the brightness level of the screen. You may change it to your own preference. Your maximum screen brightness level can be viewed here: /sys/class/backlight/acpi_video0/max_brightness
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