Adjust the brightness of the LCD using the brightnessctl utility.
brightnessctl set 0% brightnessctl set 50%brightnessctl set 100%Or use the sysfs interface:
sudo sh -c "echo 0 > /sys/class/backlight/backlight/brightness"
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sudo sh -c "echo 50 > /sys/class/backlight/backlight/brightness"
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sudo sh -c "echo 100 > /sys/class/backlight/backlight/brightness"
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To toggle the backlight on and off without adjusting the brightness, use the wlopm command. If running from an SSH session, you may need to first run export WAYLAND_DISPLAY=wayland-0.
wlopm –off HDMI-A-1wlopm –on HDMI-A-1Or, use the sysfs interface:
sudo sh -c "echo 4 > /sys/class/backlight/backlight/bl_power"
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sudo sh -c "echo 0 > /sys/class/backlight/backlight/bl_power"
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