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How to fix screen brightness in Ubuntu 12.04 (not maximum brightness after reboot)
sudo echo 4 > /sys/class/backlight/acpi_video0/brightness
Note: 4 is my setting. 20 is maximum.
You can set to 9 if you want to set the brightness as mid.
4 is good for me to use battery
After editing this Save and reboot your computer.
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