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 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. I've also been taking a look at the arch wiki ( backlight) and found something strange. Using xbacklight -set 50 has no effect eitherĬhanging the value of brightness directly in /sys/class/backlight/acpi_video0/brightness, /sys/class/backlight/actual_brightness or /sys/class/backlight/max_brightness doesn't work. "brightness" but that actually only affects the gamma. Using xrandr -output DP_2 -brightness 0.8 allows to change the Switchable graphics but I ended up with a black screen during boot I've tried to change in the BIOS the option of Graphic device to Updating grub config with different options for acpi_backlight I have tried all the solutions that I could fine but nothing happens. So, like many other users, I can't set the brightness of my laptop using Fn keys or the brightness controls on settings.
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