Comment 2 for bug 518002

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Wolfgang Kufner (wolfgangkufner) wrote : Re: lucid extensa 5635z backlight dimming not working at all

On karmic it did not work either, but could be worked around by switching to other methods:

e.g.:
xrandr --output LVDS --set BACKLIGHT_CONTROL native

xrandr --prop shows the available methods:
 BACKLIGHT_CONTROL: native
  supported: native legacy combination kernel
 BACKLIGHT: 10867 (0x00002a73) range: (0,10867)

set the level with:
xrandr --output LVDS --set BACKLIGHT 500
The LED backlight really has 10000 levels. Absolutely smooth dimming is possible!

On lucid (with KMS) other methods are no longer available. And kernel method never worked, even in karmic.