It looks like your system is reporting strange numbers for number of
brightness levels. In first screen-shot (and attached lshal output), you
can see that there is only *one* level reported, while second screen
shot shows very large number of brightness levels. I would suspect this
is problem of your HW (buggy BIOS?) or kernel/hal which is reporting
wrong levels.

** Changed in: kde-guidance (Ubuntu)
       Status: New => Incomplete

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[amd64 gutsy] kde-guidance-powermanager brightness controls missing
https://bugs.launchpad.net/bugs/139205
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Team, which is a bug contact for kde-guidance in ubuntu.

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