Brightness is a very important factor when using any device in this mordern age. Many devices produce a large amount of light which is not good to for our eyes. To reduce the amount of light from your device’s screen, enable/use a dark theme.
In Linux, screen brightess is rather complex and I hope this brief article will help you understand.
The brightness of the screen backlight is adjusted by setting the power level of the backlight LEDs or cathodes. The power level can often be controlled using the ACPI kernel module for video.
An interface to this module is provided via a sysfs directory at /sys/class/backlight/.
Adjusting The Brightness
For this post I will be using a DELL laptop. First of all most commands require root access, so log-in as root.
List the backlight graphics model:
The maximum brightness can be found by reading from max_brightness, which is often 15.
To set a specific brightness, add it to the brightness variable.
echo > 100 sys/class/backlight/intel_backlight/brightness
You can set whichever value you want depending on the brightness you require.