Ubuntu
xbacklight package

  1. Bug #176888
  2. Comment #34

Comment 34 for bug 176888

Revision history for this message
Michael Doube (michael-doube) wrote : Re: Backlight dimming not working in Hardy or Intrepid because of wrong XRandR BACKLIGHT_CONTROL setting

Also, you could try booting a liveCD (or liveUSB) of Jaunty alpha4, which has improved support for backlight on Intel in Sony.

http://cdimage.ubuntu.com/releases/jaunty/alpha-4/