On my laptop, a Thinkpad X1 Carbon with Intel chipset, I can set the screen brightness to max with this simple command:
$ cat /sys/class/backlight/intel_backlight/max_brightness |
sudo tee /sys/class/backlight/intel_backlight/brightness
Of course, you can set it to any value, as long as it doesn't exceed
the value in max_brightness:
$ cat /sys/class/backlight/intel_backlight/max_brightness
19393
$ echo 1800 | sudo tee /sys/class/backlight/intel_backlight/brightness
$
