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=80and 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.