I have now made some tests and the xbacklight utility seems to be completely 
irrelevant to this problem.
This is purely a hal issue.

The problem is basically this, to be more consice:

1) The fujitsu-laptop module creates /sys/class/backlight/fujitsu-laptop
2) Hal sees the interface, hence gpm believes it can handle the backlight
3) The backlight does not change, not with gpm, and neither with the brightness 
applet


** Summary changed:

- gnome-power-manager does not handle backlight properly
+ gnome-power-manager does not handle backlight properly on fujitsu platforms

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gnome-power-manager does not handle backlight properly on fujitsu platforms
https://bugs.launchpad.net/bugs/197253
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