Mostafa:

Check the output of:
]$ lspci

What graphics card is listed?  If you are running in SPEED mode it will 
probably be an nVidia card and you should look here for help: 
https://bugs.launchpad.net/bugs/95444

Mike

-- 
Backlight dimming not working in Hardy or Intrepid  because of wrong XRandR 
BACKLIGHT_CONTROL setting
https://bugs.launchpad.net/bugs/176888
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