First of all,sorry for my bad English.

  • Im using Xubuntu 12.04 on Acer Aspire One D270.My Screen brightness hotkeys (Fn+L/R) dont work.I installed xbacklight but it always shows "No outputs have backlight property". So I used this command: sudo setpci -s 00:02.0 F4.B=80 and it does work!

  • I made a session startup name "Brightness",Command:"sudo setpci -s 00:02.0 F4.B=80" but still have to manually execute from Terminal.

Both with xbacklight or Startup Script is OK,as long as I can control my screen brightness.

P/S:Im noob,so please explain in detail.

1 Answer 1


Now that sudo setpci -s 00:02.0 F4.B=80 is working for you, lets make it executed everytime you login.

Please do the following

  1. sudo vim /etc/rc.local

    It might ask you to enter your root password. and then it will open up a window

  2. Now press Shift+G. This will take you to the last line of the file.

  3. Press i

  4. Now type sudo setpci -s 00:02.0 F4.B=80

  5. Press Esc

  6. And then type :wq

Thats it. Restart your computer. That command will be executed automatically everytime you login, so that you dont have to execute it manually.

  • Can you please format your texT? Please use this for help in formatting askubuntu.com/editing-help#comment-formatting Apr 27, 2013 at 14:29
  • thank you,sir.I installed vim and did exactly what you said.It looks like: echo 6 > /sys/class/backlight/acpi_video0/brightness sudo setpci -s 00:02.0 F4.B=80 exit 0 then type :wq,press Enter. Still have to execute manually :( Apr 27, 2013 at 14:34
  • So, you have saved that file with sudo setpci -s 00:02.0 F4.B=80 in it, right? Apr 27, 2013 at 14:35
  • yes,right between "echo 6> blah blah" and "exit 0" Apr 27, 2013 at 14:41
  • Fine, now restart and see whether it is working properly. Apr 27, 2013 at 14:41

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