Backlight control does not work on Toshiba Satellite C660 with Ubuntu 10.04 64 bits. Hot keys Fn 6 and Fn 7 are active but have no effect on the brightness of the LCD

I saw many threads in ubuntufourms and others but nothing worked.

Please note that I added the line Option "RegistryDwords" "EnableBrightnessControl=1" to the /etc/X11/xorg.conf but it wont work, unlike before I format my PC, there was 2 OS windows and ubuntu, now I formatted and left the Ubuntu only.

Any cooperation would be appreciated.

Best regards