# echo 5 > /sys/class/backlight/acpi_video0/brightnessīy default, only root can change the brightness by this method. Attempting to set a brightness greater than the maximum results in an error. The brightness can be set by writing a number to brightness. $ cat /sys/class/backlight/acpi_video0/max_brightness 15 The maximum brightness can be displayed by reading from max_brightness, which is often 15. $ ls /sys/class/backlight/acpi_video0/ actual_brightness brightness max_brightness subsystem/ uevent The directory contains the following files and subdirectories: If you use an Intel card, simply replace acpi_video0 with intel_backlight in the examples. In the following examples, acpi_video0 is used. In the case of an Intel card, the directory is called intel_backlight. In this case, the backlight is managed by an ATI graphics card. The name of the directory depends on the graphics card model. An interface to this module is provided via a sysfs(5) directory at /sys/class/backlight/. The power level can often be controlled using the ACPI kernel module for video. The brightness of the screen backlight is adjusted by setting the power level of the backlight LEDs or cathodes. 6.8 Backlight is always at full brightness after a reboot with amdgpu driver.6.7 xbacklight returns : No outputs have backlight property.6.4 sysfs modified but no brightness change.6.3 Unable to control eDP Panel brightness (Intel i915 only).6.2 Inverted Brightness (Intel i915 only).6.1 Backlight PWM modulation frequency (Intel i915 only).5.2 Xorg: adjust perceived brightness with xrandr.

Asus intel graphics driver windows 10