Same here, VGN-C2Z, VGA compatible controller: nVidia Corporation G72M [GeForce 
Go 7400] (rev a1)
Tested on Karmic, the nVidia display settings only controls contrast & 
brightness, NOT the brightness of the backlight.
Also area where the SONY logo is very hot, suspecting the backlight is working 
on full blown.

-- 
[i965] 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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