Comment 2 for bug 1250401

This command works to change the brightness to be max
cat /sys/class/backlight/intel_backlight/max_brightness | sudo tee -a /sys/class/backlight/intel_backlight/brightnes

or adjust the brightness by a integer, for example, 400
echo <a-integer-for-example-400> | sudo tee -a /sys/class/backlight/intel_backlight/brightnes