Display controls

Turn off the display and adjust screen brightness.

Turn display on or off

Verify framebuffer support
Section titled “Verify framebuffer support”

The framebuffer blanking control may not be available or supported by every graphics driver.
Terminal window
```
ls /sys/class/backlight/
```
Turn display off
Section titled “Turn display off”
Terminal window
```
echo 1 | sudo tee /sys/class/graphics/fb0/blank
```
Turn display on
Section titled “Turn display on”
Terminal window
```
echo 0 | sudo tee /sys/class/graphics/fb0/blank
```

Adjust display brightness

Identify backlight controllers
Section titled “Identify backlight controllers”
Terminal window
```
ls /sys/class/backlight/
```

Set minimum brightness

echo 0 | sudo tee /sys/class/backlight/acpi_video0/brightness; echo 0 | sudo tee /sys/class/backlight/acpi_video1/brightness

Check maximum brightness

cat /sys/class/backlight/acpi_video0/max_brightness; cat /sys/class/backlight/acpi_video1/max_brightness

Set maximum brightness

echo 84 | sudo tee /sys/class/backlight/acpi_video0/brightness; echo 84 | sudo tee /sys/class/backlight/acpi_video1/brightness