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.
--
lucid extensa 5635z backlight dimming not working at all
https://bugs.launchpad.net/bugs/518002
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