Ubuntu – Decrease Backlight Below Minimum


I have this laptop that doesn't handle the backlight very well.

In /etc/default/grub, I have added a acpi_backlight=vendor function to get it to work at all. Which is cool, and the backlight now actually works, but the minimum backlight setting is still pretty high.

Is there any way to decrease the backlight below minimum? I don't mind having to type in the terminal to do that, as I won't need to do it often (just at night etc.)

Best Answer

  1. Open Terminal (Ctrl+Alt+T).

  2. Enter the following command:

    cat /sys/class/backlight/intel_backlight/brightness
  3. Write down the resulting value (12421 in my case).

  4. Divide value by 6 and write it down (2070 in my case).

  5. Enter the following in the terminal, replacing 2070 with your value:

    sudo su -c "echo 2070 >/sys/class/backlight/intel_backlight/brightness"
  6. Close Terminal.

  7. For future usage of the last command, open Terminal, press Ctrl and R together, start typing brightness. When the last command appears, just press Enter.

It works for me on a Samsung NC110 with Ubuntu 12.04.

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