I think I have the same problem with you.  My laptop is HP dv2210us
which is a model of dv2000z series.  I cannot adjust the LCD brightness
through Fn keys.  Moreover, there is no brightness slider in gnome-
power-management.  I then install Kubuntu which I use more often before,
however, the kpowersave report that HAL cannot recognize my hardware
when I try to adjust the LCD brightness.

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Brightness control via ACPI in HP notebooks
https://bugs.launchpad.net/bugs/82188
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Bugs, which is the bug contact for Ubuntu.

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