light
controls the backlight brightness of laptop screens and other devices
TLDR
Get current backlight value
$ light
Set backlight to 50%$ light -S 50
Increase backlight by 20%$ light -A 20
Decrease backlight by 20%$ light -U 20
SYNOPSIS
light [options]
DESCRIPTION
light controls the backlight brightness of laptop screens and other controllable backlights. It works without X or Wayland and can save and restore brightness levels.
PARAMETERS
-S PERCENT
Set brightness to specified percent-A PERCENT
Add percent to current brightness-U PERCENT
Subtract percent from current brightness-G
Get current brightness (default)-O
Save current brightness-I
Restore previously saved brightness-N PERCENT
Set minimum brightness cap-P
Get minimum brightness cap-L
List available devices-s DEVICE
Select specific device-r
Interpret values in raw mode (device-specific values instead of percent)
CAVEATS
May require udev rules for non-root access. Works with devices exposed through /sys/class/backlight. The minimum brightness cap (-N) prevents the display from going completely dark on controllers that turn off at 0.
SEE ALSO
xbacklight(1), brightnessctl(1)
