![]() Get the maximum brightness level: cat /sys/class/backlight/acpi_video0/max_brightness Get the current brightness level: cat /sys/class/backlight/acpi_video0/brightness Otherwise, you can use the below commands (replace acpi_video0 accordingly): If nothing is found, the kernel does not support brightness control (missing drivers?). Example output would be: /sys/class/backlight/acpi_video0/brightness ![]() ![]() Run: ls /sys/class/backlight/*/brightness. If the GUI tools fail, try to use the terminal for it. ![]()
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